staging: lustre: honor error code from ll_iget().

Commit 020ecc6f ("staging: lustre: llite: Remove IS_ERR tests")
changed ll_prep_inode to assume any error from ll_iget() meant
-ENOMEM because at that time it only returned NULL for errors.
Commit c3397e7e ("staging: lustre: llite: add error handler in
inode prepare phase") changed ll_iget() to once again return
meaningful codes, but nobody told ll_prep_inode().

So change ll_prep_inode() back to using PTR_ERR(*inode).
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/llite_lib.c

@@ -2143,7 +2143,7 @@ int ll_prep_inode(struct inode **inode, struct ptlrpc_request *req,
 				md.posix_acl = NULL;
 			}
 #endif
-			rc = -ENOMEM;
+			rc = PTR_ERR(*inode);
 			CERROR("new_inode -fatal: rc %d\n", rc);
 			goto out;
 		}