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: 57295e835408 ("ext4: guard against EA inode refcount underflow in xattr update")
Signed-off-by: Yang Erkun <[e-mail]>
Reviewed-by: Baokun Li <[e-mail]>
Reviewed-by: Zhang Yi <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Theodore Ts'o <[e-mail]>
Cc: [e-mail]

fs/ext4/xattr.c

···
 		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;
 	}