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qio: handle common case in trimblock()

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

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

@@ -243,7 +243,10 @@

 	Block *nb, *startb;

 	QDEBUG checkb(bp, "trimblock 1");

-	if(blocklen(bp) < offset+len) {

+	l = blocklen(bp);

+	if(offset == 0 && len == l)

+		return bp;

+	if(l < offset+len) {

 		freeblist(bp);

 		return nil;

 	}