[libvirt] [PATCH 2/4] Resolve valgrind error in virStorageBackendCreateQemuImgCmd()

[John Ferlan]

Commit id '53d5967c' introduced the following:

TEST: storagevolxml2argvtest
      ..............                           14  OK
==25636== 358 (264 direct, 94 indirect) bytes in 1 blocks are definitely lost in loss record 67 of 75
==25636==    at 0x4A06B6F: calloc (vg_replace_malloc.c:593)
==25636==    by 0x4C95791: virAlloc (viralloc.c:124)
==25636==    by 0x4CA0BB4: virCommandNewArgs (vircommand.c:805)
==25636==    by 0x4CA0C88: virCommandNew (vircommand.c:789)
==25636==    by 0x408602: virStorageBackendCreateQemuImgCmd (storage_backend.c:849)
==25636==    by 0x405427: testCompareXMLToArgvHelper (storagevolxml2argvtest.c:61)
==25636==    by 0x4064DF: virtTestRun (testutils.c:158)
==25636==    by 0x40516F: mymain (storagevolxml2argvtest.c:195)
==25636==    by 0x406B1A: virtTestMain (testutils.c:722)
==25636==    by 0x37C1021A04: (below main) (libc-start.c:225)
==25636==
PASS: storagevolxml2argvtest
---
 src/storage/storage_backend.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
index ae25c89..9a3bcf8 100644
--- a/src/storage/storage_backend.c
+++ b/src/storage/storage_backend.c
@@ -865,8 +865,10 @@ virStorageBackendCreateQemuImgCmd(virConnectPtr conn,
                                                do_encryption, preallocate,
                                                vol->target.format,
                                                vol->target.compat,
-                                               vol->target.features) < 0)
+                                               vol->target.features) < 0) {
+            virCommandFree(cmd);
             return NULL;
+        }
         if (opts)
             virCommandAddArgList(cmd, "-o", opts, NULL);
         VIR_FREE(opts);
-- 
1.8.1.4