[fallin] undo changes which put background on top

src/demo/fallin.c

@@ -183,44 +183,30 @@ int fallin_demo(struct notcurses* nc){
       x += newx;
     }
   }
-  struct ncplane* n = NULL;
+  ncplane_erase(stdn);
 #ifndef DFSG_BUILD
   if(notcurses_canopen_images(nc)){
-    char* path = find_data("lamepatents.jpg");
-    if(path == NULL){
-      goto err;
-    }
-    struct ncvisual* ncv = ncvisual_from_file(path);
-    free(path);
-    if(ncv == NULL){
-      goto err;
-    }
-    struct ncplane_options nopts = {
-      .rows = dimy - 2,
-      .cols = dimx,
-      .y = 1,
-    };
-    n = ncplane_create(stdn, &nopts);
-    if(n == NULL){
-      goto err;
-    }
-    struct ncvisual_options vopts = {
-      .scaling = NCSCALE_STRETCH,
-      //.blitter = NCBLIT_PIXEL,
-      .n = n,
-    };
-    if(ncvisual_render(nc, ncv, &vopts) == NULL){
-      ncvisual_destroy(ncv);
-      goto err;
-    }
-    assert(ncvisual_decode(ncv) == 1);
+  char* path = find_data("lamepatents.jpg");
+  struct ncvisual* ncv = ncvisual_from_file(path);
+  free(path);
+  if(ncv == NULL){
+    goto err;
+  }
+  struct ncvisual_options vopts = {
+    .n = stdn,
+    .scaling = NCSCALE_STRETCH,
+  };
+  if(ncvisual_render(nc, ncv, &vopts) == NULL){
     ncvisual_destroy(ncv);
+    goto err;
+  }
+  assert(ncvisual_decode(ncv) == 1);
+  ncvisual_destroy(ncv);
   }
 #endif
   int ret = drop_bricks(nc, arr, arrcount);
   free(arr);
   free(usemap);
-  ncplane_destroy(n);
   return ret;
 
 err: