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kernel: leave shared, physical and fixed segments alone in killbig()

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

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

@@ -1552,11 +1552,17 @@

 	kp->procctl = Proc_exitbig;

 	for(i = 0; i < NSEG; i++) {

 		s = kp->seg[i];

-		if(s != nil) {

-			qlock(s);

-			mfreeseg(s, s->base, (s->top - s->base)/BY2PG);

-			qunlock(s);

+		if(s == nil)

+			continue;

+		switch(s->type & SG_TYPE){

+		case SG_SHARED:

+		case SG_PHYSICAL:

+		case SG_FIXED:

+			continue;

 		}

+		qlock(s);

+		mfreeseg(s, s->base, (s->top - s->base)/BY2PG);

+		qunlock(s);

 	}

 	qunlock(&kp->seglock);

 }