o don't bother printing error message if signal() returns ESRCH

src/srun/signals.c

@@ -336,7 +336,7 @@ static void * _p_signal_task(void *args)
 	 *  Report error unless it is "Invalid job id" which 
 	 *    probably just means the tasks exited in the meanwhile.
 	 */
-	if ((rc != 0) && (rc != ESLURM_INVALID_JOB_ID)) 
+	if ((rc != 0) && (rc != ESLURM_INVALID_JOB_ID) && (rc != ESRCH)) 
 		error("%s: signal: %s", host, slurm_strerror(rc));
 
     done: