samterm: avoid flushimage when theres nothing new to flush

diff --git a/sys/src/cmd/samterm/io.c b/sys/src/cmd/samterm/io.c
index fd12b0ab4f007909f6f8aade6639614ddc8877d7..86fb4ceb3d95c106158c62c9b931dc94d434b48c 100644 (file)
--- a/sys/src/cmd/samterm/io.c
+++ b/sys/src/cmd/samterm/io.c
@@ -129,7 +129,8 @@ again:
 
        if(got & ~block)
                return got & ~block;
-       flushimage(display, 1);
+       if(display->bufp > display->buf)
+               flushimage(display, 1);
        type = alt(alts);
        switch(type){
        case RHost: