btrfs: fix build warning

We were getting build warning about:
fs/btrfs/extent-tree.c:7021:34: warning: ‘used_bg’ may be used
	uninitialized in this function

It is not a valid warning as used_bg is never used uninitilized since
locked is initially false so we can never be in the section where
'used_bg' is used. But gcc is not able to understand that and we can
initialize it while declaring to silence the warning.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e2287c7c10bebbbb6dc68f0c4aed056a97bdaafe..f24e4c3210fe615e629503cb9dd7d9b750ebba7d 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7018,7 +7018,7 @@ btrfs_lock_cluster(struct btrfs_block_group_cache *block_group,
                   struct btrfs_free_cluster *cluster,
                   int delalloc)
 {
-       struct btrfs_block_group_cache *used_bg;
+       struct btrfs_block_group_cache *used_bg = NULL;
        bool locked = false;
 again:
        spin_lock(&cluster->refill_lock);