ext4: release page cache in ext4_mb_load_buddy error path

Add missing page_cache_release in the error path of ext4_mb_load_buddy
Signed-off-by: NYang Ruirui <ruirui.r.yang@tieto.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org

fs/ext4/mballoc.c

@@ -1273,6 +1273,8 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
 	return 0;
 
 err:
+	if (page)
+		page_cache_release(page);
 	if (e4b->bd_bitmap_page)
 		page_cache_release(e4b->bd_bitmap_page);
 	if (e4b->bd_buddy_page)