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swap: fix pager nil pointer derefence when running out of procs

--- a/sys/src/9/port/devswap.c

+++ b/sys/src/9/port/devswap.c

@@ -183,12 +183,10 @@

 		i = ageclock;

 		do {

-			p = proctab(x++);

-			if(p == nil){

+			while((p = proctab(x++)) == nil){

 				if(++ageclock == i)

 					goto Killbig;

 				x = 0;

-				continue;

 			}

 		} while(p->state == Dead || p->noswap || !canqlock(&p->seglock));

 		up->psstate = "Pageout";