Zero-initialize Png struct width and height just in case

include/gfx/png.hpp

@@ -10,7 +10,8 @@
 #include "gfx/rgba.hpp"
 
 struct Png {
-	uint32_t width, height;
+	uint32_t width = 0;
+	uint32_t height = 0;
 	std::vector<Rgba> pixels{};
 	std::vector<Rgba> palette{};