Rework error messages generated when login fails to not repeat the same

thing "Failed to login to target" several times as the error cascades
up through the layers of callbacks.

src/iscsi-inq.c

@@ -217,7 +217,7 @@ int main(int argc, const char *argv[])
 	}
 
 	if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
-		fprintf(stderr, "Failed to log in to target %s\n", iscsi_get_error(iscsi));
+		fprintf(stderr, "Login Failed. %s\n", iscsi_get_error(iscsi));
 		iscsi_destroy_url(iscsi_url);
 		iscsi_destroy_context(iscsi);
 		exit(10);