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kernel: remove "checked xxx page table entries" print from checkpages()

the purpose of checkpages() is to verify consitency of the hardware mmu state,
not to notify on the console that a program faulted. a program could also
continue after handling the note. (this seems to be the case in go programs)

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

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

@@ -389,7 +389,6 @@

 void

 checkpages(void)

 {

-	int checked;

 	uintptr addr, off;

 	Pte *p;

 	Page *pg;

@@ -398,7 +397,6 @@

 	if(up == nil)

 		return;

-	checked = 0;

 	for(sp=up->seg, ep=&up->seg[NSEG]; sp<ep; sp++){

 		if((s = *sp) == nil)

 			continue;

@@ -411,9 +409,7 @@

 			if(pagedout(pg))

 				continue;

 			checkmmu(addr, pg->pa);

-			checked++;

 		}

 		qunlock(s);

 	}

-	print("%ld %s: checked %d page table entries\n", up->pid, up->text, checked);

 }