have procwired force switch to correct cpu immediately.

Notes:
Sun Jun 1 18:45:22 EDT 2008 geoff
    there's no guarantee that the proc just wired will be the next
    scheduled to run.


Reference: /n/sources/patch/sorry/wiredswtch
Date: Mon May 19 17:33:26 CES 2008
Signed-off-by: quanstro@quanstro.net
Reviewed-by: geoff

--- /sys/src/9/port/proc.c	Mon May 19 17:32:28 2008
+++ /sys/src/9/port/proc.c	Mon May 19 17:32:25 2008
@@ -683,6 +683,7 @@
 
 	p->wired = MACHP(bm);
 	p->mp = p->wired;
+	sched();  /* force switch to correct cpu */
 }
 
 void