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kernel: only complain about no images when theres nothing more to reclaim

uncaching a thousand pages (arround 4MB) might not be
enougth. so keep on reclaiming pages and only complain
once theres nothing more to reclaim.

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

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

@@ -250,8 +250,7 @@

 	/* dump pages of inactive images to free image structures */

 	while((i = imagealloc.free) == nil) {

 		unlock(&imagealloc);

-		imagereclaim(1000);

-		if(imagealloc.free == nil){

+		if(imagereclaim(1000) == 0 && imagealloc.free == nil){

 			freebroken();		/* can use the memory */

 			resrcwait("no image after reclaim");

 		}