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samterm: avoid flushimage when theres nothing new to flush

--- a/sys/src/cmd/samterm/io.c

+++ b/sys/src/cmd/samterm/io.c

@@ -129,7 +129,8 @@

 	if(got & ~block)

 		return got & ~block;

-	flushimage(display, 1);

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

+		flushimage(display, 1);

 	type = alt(alts);

 	switch(type){

 	case RHost: