[PATCH v2] block/snapshot: Fix compiler warning with -Wshadow=local

[Thomas Huth <thuth@redhat.com>]

No need to declare a new variable in the the inner code block
here, we can re-use the "ret" variable that has been declared
at the beginning of the function. With this change, the code
can now be successfully compiled with -Wshadow=local again.

Fixes: a32e781838 ("Mark bdrv_snapshot_fallback() and callers GRAPH_RDLOCK")
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 v2: Assign "ret" only in one spot

 block/snapshot.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/block/snapshot.c b/block/snapshot.c
index 6e16eb803a..55974273ae 100644
--- a/block/snapshot.c
+++ b/block/snapshot.c
@@ -629,7 +629,6 @@ int bdrv_all_goto_snapshot(const char *name,
     while (iterbdrvs) {
         BlockDriverState *bs = iterbdrvs->data;
         AioContext *ctx = bdrv_get_aio_context(bs);
-        int ret = 0;
         bool all_snapshots_includes_bs;
 
         aio_context_acquire(ctx);
@@ -637,9 +636,8 @@ int bdrv_all_goto_snapshot(const char *name,
         all_snapshots_includes_bs = bdrv_all_snapshots_includes_bs(bs);
         bdrv_graph_rdunlock_main_loop();
 
-        if (devices || all_snapshots_includes_bs) {
-            ret = bdrv_snapshot_goto(bs, name, errp);
-        }
+        ret = (devices || all_snapshots_includes_bs) ?
+              bdrv_snapshot_goto(bs, name, errp) : 0;
         aio_context_release(ctx);
         if (ret < 0) {
             bdrv_graph_rdlock_main_loop();
-- 
2.41.0