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libdraw: don't flush in readmouse() when theres nothing to flush

--- a/sys/src/libdraw/mouse.c

+++ b/sys/src/libdraw/mouse.c

@@ -26,8 +26,11 @@

 int

 readmouse(Mousectl *mc)

 {

-	if(mc->image)

-		flushimage(mc->image->display, 1);

+	if(mc->image){

+		Display *d = mc->image->display;

+		if(d->bufp > d->buf)

+			flushimage(d, 1);

+	}

 	if(recv(mc->c, &mc->Mouse) < 0){

 		fprint(2, "readmouse: %r\n");

 		return -1;