ext4: Fix memory leak in ext4_fill_super() in case of a failed mount

Signed-off-by: NManish Katiyar <mkatiyar@gmail.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>

fs/ext4/super.c

@@ -2924,6 +2924,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	brelse(bh);
 out_fail:
 	sb->s_fs_info = NULL;
+	kfree(sbi->s_blockgroup_lock);
 	kfree(sbi);
 	lock_kernel();
 	return ret;