[libvirt] [PATCH 1/2] storage: Fix coverity warning

[Osier Yang]

Introduced by commit e0139e30444:

1777 	    /* Updating pool metadata */

(40) Event var_deref_op: Dereferencing null pointer "newvol".
     Also see events: [assign_zero]

1778 	    pool->def->allocation += newvol->allocation;
1779 	    pool->def->available -= newvol->allocation;
---
 src/storage/storage_driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index 7908ba6..63a954b 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -1758,7 +1758,6 @@ storageVolCreateXMLFrom(virStoragePoolPtr obj,
 
     origvol->building = 0;
     newvol->building = 0;
-    newvol = NULL;
     pool->asyncjobs--;
 
     if (origpool) {
@@ -1781,6 +1780,7 @@ storageVolCreateXMLFrom(virStoragePoolPtr obj,
     VIR_INFO("Creating volume '%s' in storage pool '%s'",
              volobj->name, pool->def->name);
     ret = volobj;
+    newvol = NULL;
     volobj = NULL;
 
 cleanup:
-- 
1.8.1.4