Bugfix for the new PID cache in wait(2). The simple case
of process successfull terminated was missed causing make
and sh to error and suicide respectively.

-Steve

Reference: /n/sources/patch/applied/ape-wait-bug
Date: Thu Jul  1 00:50:50 CES 2004

--- /sys/src/ape/lib/ap/plan9/wait.c	Thu Jul  1 00:50:50 2004
+++ /sys/src/ape/lib/ap/plan9/wait.c	Thu Jul  1 00:50:50 2004
@@ -89,6 +89,7 @@
 		if (wpid <= 0) {
 			waitmsg = w;
 			wpid = w->pid;
+			*status = 0;
 			return wpid;
 		}
 		if (w->pid == wpid) {