staging: lustre: fid: perform sanity checks before commiting

When fid fetches a new range from the server, it commits
to it (*output = *out) *before* performing sanity checks.
This looks backwards.
Don't commit to a value until it has been found to be sane.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/fid/fid_request.c

@@ -118,22 +118,22 @@ static int seq_client_rpc(struct lu_client_seq *seq,
 		goto out_req;
 
 	out = req_capsule_server_get(&req->rq_pill, &RMF_SEQ_RANGE);
-	*output = *out;
 
-	if (!lu_seq_range_is_sane(output)) {
+	if (!lu_seq_range_is_sane(out)) {
 		CERROR("%s: Invalid range received from server: "
-		       DRANGE "\n", seq->lcs_name, PRANGE(output));
+		       DRANGE "\n", seq->lcs_name, PRANGE(out));
 		rc = -EINVAL;
 		goto out_req;
 	}
 
-	if (lu_seq_range_is_exhausted(output)) {
+	if (lu_seq_range_is_exhausted(out)) {
 		CERROR("%s: Range received from server is exhausted: "
-		       DRANGE "]\n", seq->lcs_name, PRANGE(output));
+		       DRANGE "]\n", seq->lcs_name, PRANGE(out));
 		rc = -EINVAL;
 		goto out_req;
 	}
 
+	*output = *out;
 	CDEBUG_LIMIT(debug_mask, "%s: Allocated %s-sequence " DRANGE "]\n",
 		     seq->lcs_name, opcname, PRANGE(output));