storage: Cleanup logical volume creation code

This patch plugs two memory leaks, removes some useless and confusing
constructs and renames renames "cleanup" label as "error" since it is
only used for error path rather then being common for both success and
error paths.

src/storage/storage_backend_logical.c

@@ -700,7 +700,7 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn,
                                   virStoragePoolObjPtr pool,
                                   virStorageVolDefPtr vol)
 {
-    int fdret, fd = -1;
+    int fd = -1;
     virCommandPtr cmd = NULL;
     virErrorPtr err;
 
@@ -741,11 +741,13 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn,
         virCommandAddArg(cmd, pool->def->source.name);
 
     if (virCommandRun(cmd, NULL) < 0)
-        goto cleanup;
+        goto error;
 
-    if ((fdret = virStorageBackendVolOpen(vol->target.path)) < 0)
-        goto cleanup;
-    fd = fdret;
+    virCommandFree(cmd);
+    cmd = NULL;
+
+    if ((fd = virStorageBackendVolOpen(vol->target.path)) < 0)
+        goto error;
 
     /* We can only chown/grp if root */
     if (getuid() == 0) {
@@ -753,40 +755,40 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn,
             virReportSystemError(errno,
                                  _("cannot set file owner '%s'"),
                                  vol->target.path);
-            goto cleanup;
+            goto error;
         }
     }
     if (fchmod(fd, vol->target.perms.mode) < 0) {
         virReportSystemError(errno,
                              _("cannot set file mode '%s'"),
                              vol->target.path);
-        goto cleanup;
+        goto error;
     }
 
     if (VIR_CLOSE(fd) < 0) {
         virReportSystemError(errno,
                              _("cannot close file '%s'"),
                              vol->target.path);
-        goto cleanup;
+        goto error;
     }
-    fd = -1;
 
     /* Fill in data about this new vol */
     if (virStorageBackendLogicalFindLVs(pool, vol) < 0) {
         virReportSystemError(errno,
                              _("cannot find newly created volume '%s'"),
                              vol->target.path);
-        goto cleanup;
+        goto error;
     }
 
     return 0;
 
- cleanup:
+ error:
     err = virSaveLastError();
     VIR_FORCE_CLOSE(fd);
     virStorageBackendLogicalDeleteVol(conn, pool, vol, 0);
     virCommandFree(cmd);
     virSetError(err);
+    virFreeError(err);
     return -1;
 }