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nusb/cam: rather than showing partially green frames (when not enough bandwidth), skip those altogether

--- a/sys/src/cmd/nusb/cam/video.c

+++ b/sys/src/cmd/nusb/cam/video.c

@@ -161,10 +161,8 @@

 		rc = read(c->ep->dfd, buf, sizeof(buf));

 		if(c->abort || rc < 0) break;

 		if(rc == 0) continue;

-		if(((ob ^ buf[1]) & 1) != 0 && bufn != 0){

-			if(!c->framemode || bufn == frsz){

-				if(bufn < frsz)

-					memset(fbuf + bufn, 0, frsz - bufn);

+		if((ob ^ buf[1]) & 1){

+			if(bufn == frsz){

 				of = grabframe(c);

 				cvt->fn(f, g, fbuf, of);

 				pushframe(c, of);