snapshot: simplify esx snapshot name lookup

No need to request the parent of a snapshot if we aren't going to use it.

* src/esx/esx_vi.c (esxVI_GetSnapshotTreeByName): Make parent
optional.
* src/esx/esx_driver.c (esxDomainSnapshotCreateXML)
(esxDomainSnapshotLookupByName, esxDomainRevertToSnapshot)
(esxDomainSnapshotDelete): Simplify accordingly.

src/esx/esx_driver.c

@@ -4228,7 +4228,6 @@ esxDomainSnapshotCreateXML(virDomainPtr domain, const char *xmlDesc,
     esxVI_ObjectContent *virtualMachine = NULL;
     esxVI_VirtualMachineSnapshotTree *rootSnapshotList = NULL;
     esxVI_VirtualMachineSnapshotTree *snapshotTree = NULL;
-    esxVI_VirtualMachineSnapshotTree *snapshotTreeParent = NULL;
     esxVI_ManagedObjectReference *task = NULL;
     esxVI_TaskInfoState taskInfoState;
     char *taskInfoErrorMessage = NULL;
@@ -4259,7 +4258,7 @@ esxDomainSnapshotCreateXML(virDomainPtr domain, const char *xmlDesc,
         esxVI_LookupRootSnapshotTreeList(priv->primary, domain->uuid,
                                          &rootSnapshotList) < 0 ||
         esxVI_GetSnapshotTreeByName(rootSnapshotList, def->name,
-                                    &snapshotTree, &snapshotTreeParent,
+                                    &snapshotTree, NULL,
                                     esxVI_Occurrence_OptionalItem) < 0) {
         goto cleanup;
     }
@@ -4437,7 +4436,6 @@ esxDomainSnapshotLookupByName(virDomainPtr domain, const char *name,
     esxPrivate *priv = domain->conn->privateData;
     esxVI_VirtualMachineSnapshotTree *rootSnapshotTreeList = NULL;
     esxVI_VirtualMachineSnapshotTree *snapshotTree = NULL;
-    esxVI_VirtualMachineSnapshotTree *snapshotTreeParent = NULL;
     virDomainSnapshotPtr snapshot = NULL;
 
     virCheckFlags(0, NULL);
@@ -4449,7 +4447,7 @@ esxDomainSnapshotLookupByName(virDomainPtr domain, const char *name,
     if (esxVI_LookupRootSnapshotTreeList(priv->primary, domain->uuid,
                                          &rootSnapshotTreeList) < 0 ||
         esxVI_GetSnapshotTreeByName(rootSnapshotTreeList, name, &snapshotTree,
-                                    &snapshotTreeParent,
+                                    NULL,
                                     esxVI_Occurrence_RequiredItem) < 0) {
         goto cleanup;
     }
@@ -4567,7 +4565,6 @@ esxDomainRevertToSnapshot(virDomainSnapshotPtr snapshot, unsigned int flags)
     esxPrivate *priv = snapshot->domain->conn->privateData;
     esxVI_VirtualMachineSnapshotTree *rootSnapshotList = NULL;
     esxVI_VirtualMachineSnapshotTree *snapshotTree = NULL;
-    esxVI_VirtualMachineSnapshotTree *snapshotTreeParent = NULL;
     esxVI_ManagedObjectReference *task = NULL;
     esxVI_TaskInfoState taskInfoState;
     char *taskInfoErrorMessage = NULL;
@@ -4581,7 +4578,7 @@ esxDomainRevertToSnapshot(virDomainSnapshotPtr snapshot, unsigned int flags)
     if (esxVI_LookupRootSnapshotTreeList(priv->primary, snapshot->domain->uuid,
                                          &rootSnapshotList) < 0 ||
         esxVI_GetSnapshotTreeByName(rootSnapshotList, snapshot->name,
-                                    &snapshotTree, &snapshotTreeParent,
+                                    &snapshotTree, NULL,
                                     esxVI_Occurrence_RequiredItem) < 0) {
         goto cleanup;
     }
@@ -4621,7 +4618,6 @@ esxDomainSnapshotDelete(virDomainSnapshotPtr snapshot, unsigned int flags)
     esxPrivate *priv = snapshot->domain->conn->privateData;
     esxVI_VirtualMachineSnapshotTree *rootSnapshotList = NULL;
     esxVI_VirtualMachineSnapshotTree *snapshotTree = NULL;
-    esxVI_VirtualMachineSnapshotTree *snapshotTreeParent = NULL;
     esxVI_Boolean removeChildren = esxVI_Boolean_False;
     esxVI_ManagedObjectReference *task = NULL;
     esxVI_TaskInfoState taskInfoState;
@@ -4641,7 +4637,7 @@ esxDomainSnapshotDelete(virDomainSnapshotPtr snapshot, unsigned int flags)
     if (esxVI_LookupRootSnapshotTreeList(priv->primary, snapshot->domain->uuid,
                                          &rootSnapshotList) < 0 ||
         esxVI_GetSnapshotTreeByName(rootSnapshotList, snapshot->name,
-                                    &snapshotTree, &snapshotTreeParent,
+                                    &snapshotTree, NULL,
                                     esxVI_Occurrence_RequiredItem) < 0) {
         goto cleanup;
     }

src/esx/esx_vi.c

@@ -2243,7 +2243,7 @@ esxVI_GetSnapshotTreeByName
     esxVI_VirtualMachineSnapshotTree *candidate;
 
     if (snapshotTree == NULL || *snapshotTree != NULL ||
-        snapshotTreeParent == NULL || *snapshotTreeParent != NULL) {
+        (snapshotTreeParent && *snapshotTreeParent != NULL)) {
         ESX_VI_ERROR(VIR_ERR_INTERNAL_ERROR, "%s", _("Invalid argument"));
         return -1;
     }
@@ -2252,6 +2252,7 @@ esxVI_GetSnapshotTreeByName
          candidate = candidate->_next) {
         if (STREQ(candidate->name, name)) {
             *snapshotTree = candidate;
+            if (snapshotTreeParent)
                 *snapshotTreeParent = NULL;
             return 1;
         }
@@ -2259,7 +2260,7 @@ esxVI_GetSnapshotTreeByName
         if (esxVI_GetSnapshotTreeByName(candidate->childSnapshotList, name,
                                         snapshotTree, snapshotTreeParent,
                                         occurrence) > 0) {
-            if (*snapshotTreeParent == NULL) {
+            if (snapshotTreeParent && *snapshotTreeParent == NULL) {
                 *snapshotTreeParent = candidate;
             }