[Qemu-trivial] [PATCH trivial] block.c: Correct the return value and the failure object when failure occurs

[Chen Gang]

When failure occurs, 'ret' need be set, or may return 0 to indicate success.
And error_propagate() also need be called only one time within a function.

Signed-off-by: Chen Gang <address@hidden>
---
 block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block.c b/block.c
index 74af8d7..12ce4e4 100644
--- a/block.c
+++ b/block.c
@@ -1497,7 +1497,7 @@ int bdrv_open(BlockDriverState **pbs, const char 
*filename,
     if (snapshot_flags) {
         bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err);
         if (local_err) {
-            error_propagate(errp, local_err);
+            ret = -1;
             goto close_and_fail;
         }
     }
-- 
1.7.11.7