[tinfo] zero out sixel_maxx/sixel_maxy

src/lib/terminfo.c

@@ -346,8 +346,8 @@ query_sixel(tinfo* ti, int fd){
             ti->sixel_supported = true;
             ti->color_registers = 256;  // assumed default [shrug]
             ti->pixel_destroy = sprite_sixel_annihilate;
-//            ti->sixel_maxx = ti->sixel_maxy = 0;
-          } // FIXME else warning?
+            ti->sixel_maxx = ti->sixel_maxy = 0;
+          }
         }
         break;
       case DONE:

src/poc/pixel.c

@@ -48,7 +48,7 @@ int main(int argc, char** argv){
     .margin_r = 2,
   };
   struct notcurses* nc = notcurses_init(&opts, NULL);
-  if(!notcurses_check_pixel_support(nc)){
+  if(notcurses_check_pixel_support(nc) <= 0){
     notcurses_stop(nc);
     fprintf(stderr, "this program requires pixel graphics support\n");
     return EXIT_FAILURE;

src/tests/pixel.cpp

@@ -8,7 +8,7 @@ TEST_CASE("Pixel") {
   auto n_ = notcurses_stdplane(nc_);
   REQUIRE(n_);
 
-  if(!notcurses_check_pixel_support(nc_)){
+  if(notcurses_check_pixel_support(nc_) <= 0){
     CHECK(!notcurses_stop(nc_));
     return;
   }