ext4: fix iloc.bh leak in ext4_xattr_inode_update_ref

The error branch for ext4_xattr_inode_update_ref forget to release the
refcount for iloc.bh. Find this when review code.

Fixes: 57295e8 ("ext4: guard against EA inode refcount underflow in xattr update")
Signed-off-by: Yang Erkun <yangerkun@huawei.com>
Reviewed-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://patch.msgid.link/20251213055706.3417529-1-yangerkun@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org

Author: Yang Erkun

fs/ext4/xattr.c

@@ -1037,6 +1037,7 @@ static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode,
 		ext4_error_inode(ea_inode, __func__, __LINE__, 0,
 			"EA inode %lu ref wraparound: ref_count=%lld ref_change=%d",
 			ea_inode->i_ino, ref_count, ref_change);
+		brelse(iloc.bh);
 		ret = -EFSCORRUPTED;
 		goto out;
 	}