defrag-06 patch fixup to add sparse annotation

From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

This patch hunk was added by
aneesh-5-sparse-annotate-the-group-info-semaphore but it doesn't apply
until the defrag patches ar applied.  It should be merged up.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
diff a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c	(rejected hunks)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4805,8 +4821,10 @@ ext4_mb_search_free_extents(struct inode *inode,
 	end = EXT4_BLOCKS_PER_GROUP(sb) - 1;
 
 	err = ext4_mb_load_buddy(sb, group_no, &e4b);
-	if (err)
+	if (err) {
+		__release(e4b->alloc_semp);
 		return err;
+	}
 
 	/* We consider about the boot block if bs = 1k */
 	if (sb->s_blocksize == 1024)