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devsegment: speed up fixedseg()

If a page has non-nil Page.image, it is almost
certanly not free. So reset the search.

Note, this is not a bug. Even if we omit the
Page.image check, we still ensured that the
pages are on the freelist before comitting.

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

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

@@ -481,7 +481,8 @@

 	l = palloc.pages;

 	color = getpgcolor(va);

 	for(n = palloc.user; n >= len; n--, l++){

-		if(l->ref != 0 || i != 0 && (l[-1].pa+BY2PG) != l->pa || i == 0 && l->color != color){

+		if(l->ref != 0 || l->image != nil

+		|| i != 0 ? (l[-1].pa+BY2PG) != l->pa : l->color != color){

 		Retry:

 			i = 0;

 			continue;

-- 

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