[sheepdog] [Patch]Fix bugs of Sheepdog storage driver

[harryxiyou at gmail.com]

virStorageBackendSheepdogCreateVol calls virCommandRun whihout checking
the return value, which this return value determines us whether we should
call virStorageBackendSheepdogRefreshVol func. And we should also give a 
return value to virStorageBackendSheepdogRefreshVol func because it may
cause errors. Following patch can fix these bugs. This patch have checked
by 'make syntax-check'.

Signed-off-by: Harry Wei <harryxiyou at gmail.com>
---
 src/storage/storage_backend_sheepdog.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/src/storage/storage_backend_sheepdog.c b/src/storage/storage_backend_sheepdog.c
index cd18f33..f987604 100644
--- a/src/storage/storage_backend_sheepdog.c
+++ b/src/storage/storage_backend_sheepdog.c
@@ -168,9 +168,12 @@ virStorageBackendSheepdogCreateVol(virConnectPtr conn ATTRIBUTE_UNUSED,
     virCommandAddArgFormat(cmd, "%llu", vol->capacity);
     virStorageBackendSheepdogAddHostArg(cmd, pool);
     ret = virCommandRun(cmd, NULL);
+    if (ret < 0)
+        goto cleanup;
 
-    virStorageBackendSheepdogRefreshVol(conn, pool, vol);
+    ret = virStorageBackendSheepdogRefreshVol(conn, pool, vol);
 
+cleanup:
     virCommandFree(cmd);
     return ret;
 }
-- 
1.7.0.4