+ triplemul & little clean

funcs/sfx4.c

@@ -27,11 +27,13 @@ fprintf(stderr, ">>> %s ( %p 0x%04x )\n", __func__, img, notused);
 for (y=0; y<src->height; y++) {
 	for (x=0; x<src->width; x++) {
 		foo =  fimg_get_rgb(src, x, y, in);
+		if (foo)	return foo;
 		out[0] = in[1] * in[2];
 		out[1] = in[0] * in[2];
 		out[2] = in[0] * in[1];
 		// fprintf(stderr, "%9f %9f %9f\n", out[0], out[1], out[2]);
 		foo =  fimg_put_rgb(dst, x, y, out);
+		if (foo)	return foo;
 		}
 	}