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upas/runq: we don't care about the waitmsg, use waitpid

--- a/sys/src/cmd/upas/q/runq.c

+++ b/sys/src/cmd/upas/q/runq.c

@@ -577,7 +577,6 @@

 	char buf[256], attachment[Pathlen], *sender;

 	int fd, pfd[2];

 	long n;

-	Waitmsg *wm;

 	String *s;

 	if(av[1] == 0 || av[2] == 0){

@@ -634,8 +633,7 @@

 				break;

 			if(write(pfd[1], buf, n) != n){

 				close(fd);

-				wm = wait();

-				free(wm);

+				waitpid();

 				return -1;

 			}

 		}

@@ -642,8 +640,7 @@

 		close(fd);

 	}

 	close(pfd[1]);

-	wm = wait();

-	free(wm);

+	waitpid();

 	return 0;

 }