sched-simple: improve error log message

Problem: when the hello protocol cannot process a job, it logs
the name of the wrong rlist function.

Skip logging the function name as it's not making things clearer.

src/modules/sched-simple/sched.c

@@ -591,7 +591,7 @@ static int hello_cb (flux_t *h,
     }
     s = rlist_dumps (alloc);
     if (rlist_set_allocated (ss->rlist, alloc) < 0) {
-        flux_log_error (h, "hello: rlist_remove (%s)", s);
+        flux_log_error (h, "hello: alloc %s", s);
         goto error;
     }
     flux_log (h, LOG_DEBUG, "hello: alloc %s", s);