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upas/runq: revert b55b1f31e139271852c3581924ddc92a10f54883

this change broke the fix from 49d7ca8d92e5667f3e5ece4c6acbc1064701e2f8

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

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

@@ -597,7 +597,7 @@

 		return -1;

 	}

-	switch(rfork(RFFDG|RFPROC|RFENVG)){

+	switch(rfork(RFFDG|RFPROC|RFENVG|RFNOWAIT)){

 	case -1:

 		logit("runq - fork failed", w, name, av);

 		return -1;

@@ -633,7 +633,6 @@

 				break;

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

 				close(fd);

-				waitpid();

 				return -1;

 			}

 		}

@@ -640,7 +639,6 @@

 		close(fd);

 	}

 	close(pfd[1]);

-	waitpid();

 	return 0;

 }