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httpfile: fix evictblock() so we wont consume all the memory

--- a/sys/src/cmd/ip/httpfile.c

+++ b/sys/src/cmd/ip/httpfile.c

@@ -114,11 +114,11 @@

 	for(l=&cache->first; (b=*l) != nil; l=&b->link){

 		if(b->rq != nil)	/* dont touch block when still requests queued */

 			continue;

-		if(b->rq != nil && (oldest == nil || (*oldest)->lastuse > b->lastuse))

+		if(oldest == nil || (*oldest)->lastuse > b->lastuse)

 			oldest = l;

 	}

-	if(oldest == nil)

+	if(oldest == nil || *oldest == nil || (*oldest)->rq != nil)

 		return;

 	b = *oldest;

@@ -439,8 +439,7 @@

 		b = recvp(finishchan);

 		assert(b == inprogress.first);

 		inprogress.first = b->link;

-		ncache++;

-		if(ncache >= mcache)

+		if(++ncache >= mcache)

 			evictblock(&cache);

 		addblock(&cache, b);

 		while((r = b->rq) != nil){

@@ -448,7 +447,7 @@

 			r->aux = nil;

 			readfrom(r, b);

 		}

-		if(inprogress.first)

+		if(inprogress.first != nil)

 			sendp(httpchan, inprogress.first);

 	}

 }

-- 

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