Minor warning fixes.

gfx/gl_lost_manager.cpp

@@ -46,7 +46,7 @@ void gl_lost() {
 	}
 	ILOG("gl_lost() restoring %i items:", (int)holders->size());
 	for (size_t i = 0; i < holders->size(); i++) {
-		ILOG("GLLost(%i, %p)", i, holders->size(), (*holders)[i]);
+		ILOG("GLLost(%i / %i, %p)", (int) i, (int) holders->size(), (*holders)[i]);
 		(*holders)[i]->GLLost();
 	}
 	ILOG("gl_lost() completed restoring %i items:", (int)holders->size());

gfx/texture_gen.cpp

@@ -47,6 +47,8 @@ uint8_t *generateTexture(const char *filename, int &bpp, int &w, int &h, bool &c
 				data[y*w + x] = val * 255;
 			}
 		}
+	} else {
+		data = NULL;
 	}
 
 	return data;

image/zim_load.cpp

@@ -100,6 +100,12 @@ int LoadZIMPtr(uint8_t *zim, int datasize, int *width, int *height, int *flags,
 		total_data_size += image_data_size[i];
 	}
 
+	if (total_data_size == 0)
+	{
+		ELOG("Invalid ZIM data size 0");
+		return 0;
+	}
+
 	image[0] = (uint8 *)malloc(total_data_size);
 	for (int i = 1; i < num_levels; i++) {
 		image[i] = image[i-1] + image_data_size[i-1];