ceph: remove unnecessary IS_ERR() check in ceph_fname_to_usr()

Before returning, function ceph_fname_to_usr() does a final IS_ERR() check
in 'dir':

	if ((dir != fname->dir) && !IS_ERR(dir)) {...}

This check is unnecessary because, if the 'dir' variable has changed to
something other than 'fname->dir' (it's initial value), that error check has
been performed already and, if there was indeed an error, it would have
been returned immediately.

Besides, this useless IS_ERR() is also confusing static analysis tools.

Reported-by: kernel test robot <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]/
Signed-off-by: Luis Henriques <[email protected]>
Reviewed-by: Ilya Dryomov <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>

Author: Luis Henriques

fs/ceph/crypto.c

@@ -460,7 +460,7 @@ int ceph_fname_to_usr(const struct ceph_fname *fname, struct fscrypt_str *tname,
 out:
 	fscrypt_fname_free_buffer(&_tname);
 out_inode:
-	if ((dir != fname->dir) && !IS_ERR(dir)) {
+	if (dir != fname->dir) {
 		if ((dir->i_state & I_NEW))
 			discard_new_inode(dir);
 		else