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telco: fix rfork() race for pid

--- a/sys/src/cmd/telco/telco.c

+++ b/sys/src/cmd/telco/telco.c

@@ -72,7 +72,6 @@

 	char	rbuf[Nrbuf];

 	char	*rp;

 	char	*wp;

-	long	pid;

 };

 enum

@@ -1159,7 +1158,7 @@

 	int n;

 	char *p;

 	char file[256];

-	int background;

+	int background, pid;

 	background = 0;

 	d->ctl = d->data = -1;

@@ -1178,12 +1177,13 @@

 		if(!background){

 			background = 1;

-			switch(d->pid = rfork(RFPROC|RFMEM)){

+			switch(pid = rfork(RFPROC|RFMEM)){

 			case -1:

 				error("out of processes");

 			case 0:

 				break;

 			default:

+				d->monitoring = pid;

 				return;

 			}

 		}