Fix a reference leak for node devices.

There were some major, and some minor bugs having to do with
the reference counting of node devices in daemon/remote.c.

Some functions were completely failing to unreference node devices;
this would lead to many open file descriptors, which would eventually
fail.

The minor bugs were along the same lines, but were in rarely
used error paths.
Signed-off-by: NChris Lalancette <clalance@redhat.com>
Signed-off-by: NMatthias Bolte <matthias.bolte@googlemail.com>

daemon/remote.c

@@ -5012,11 +5012,13 @@ remoteDispatchNodeDeviceGetParent (struct qemud_server *server ATTRIBUTE_UNUSED,
         /* remoteDispatchClientRequest will free this. */
         char **parent_p;
         if (VIR_ALLOC(parent_p) < 0) {
+            virNodeDeviceFree(dev);
             remoteDispatchOOMError(rerr);
             return -1;
         }
         *parent_p = strdup(parent);
         if (*parent_p == NULL) {
+            virNodeDeviceFree(dev);
             remoteDispatchOOMError(rerr);
             return -1;
         }
@@ -5048,6 +5050,7 @@ remoteDispatchNodeDeviceNumOfCaps (struct qemud_server *server ATTRIBUTE_UNUSED,
 
     ret->num = virNodeDeviceNumOfCaps(dev);
     if (ret->num < 0) {
+        virNodeDeviceFree(dev);
         remoteDispatchConnError(rerr, conn);
         return -1;
     }
@@ -5076,6 +5079,7 @@ remoteDispatchNodeDeviceListCaps (struct qemud_server *server ATTRIBUTE_UNUSED,
     }
 
     if (args->maxnames > REMOTE_NODE_DEVICE_NAME_LIST_MAX) {
+        virNodeDeviceFree(dev);
         remoteDispatchFormatError(rerr,
                                   "%s", _("maxnames > REMOTE_NODE_DEVICE_NAME_LIST_MAX"));
         return -1;
@@ -5083,6 +5087,7 @@ remoteDispatchNodeDeviceListCaps (struct qemud_server *server ATTRIBUTE_UNUSED,
 
     /* Allocate return buffer. */
     if (VIR_ALLOC_N(ret->names.names_val, args->maxnames) < 0) {
+        virNodeDeviceFree(dev);
         remoteDispatchOOMError(rerr);
         return -1;
     }
@@ -5091,11 +5096,13 @@ remoteDispatchNodeDeviceListCaps (struct qemud_server *server ATTRIBUTE_UNUSED,
         virNodeDeviceListCaps (dev, ret->names.names_val,
                                args->maxnames);
     if (ret->names.names_len == -1) {
+        virNodeDeviceFree(dev);
         remoteDispatchConnError(rerr, conn);
         VIR_FREE(ret->names.names_val);
         return -1;
     }
 
+    virNodeDeviceFree(dev);
     return 0;
 }
 
@@ -5119,10 +5126,12 @@ remoteDispatchNodeDeviceDettach (struct qemud_server *server ATTRIBUTE_UNUSED,
     }
 
     if (virNodeDeviceDettach(dev) == -1) {
+        virNodeDeviceFree(dev);
         remoteDispatchConnError(rerr, conn);
         return -1;
     }
 
+    virNodeDeviceFree(dev);
     return 0;
 }
 
@@ -5146,10 +5155,12 @@ remoteDispatchNodeDeviceReAttach (struct qemud_server *server ATTRIBUTE_UNUSED,
     }
 
     if (virNodeDeviceReAttach(dev) == -1) {
+        virNodeDeviceFree(dev);
         remoteDispatchConnError(rerr, conn);
         return -1;
     }
 
+    virNodeDeviceFree(dev);
     return 0;
 }
 
@@ -5173,10 +5184,12 @@ remoteDispatchNodeDeviceReset (struct qemud_server *server ATTRIBUTE_UNUSED,
     }
 
     if (virNodeDeviceReset(dev) == -1) {
+        virNodeDeviceFree(dev);
         remoteDispatchConnError(rerr, conn);
         return -1;
     }
 
+    virNodeDeviceFree(dev);
     return 0;
 }
 
@@ -5223,10 +5236,12 @@ remoteDispatchNodeDeviceDestroy(struct qemud_server *server ATTRIBUTE_UNUSED,
     }
 
     if (virNodeDeviceDestroy(dev) == -1) {
+        virNodeDeviceFree(dev);
         remoteDispatchConnError(rerr, conn);
         return -1;
     }
 
+    virNodeDeviceFree(dev);
     return 0;
 }