Merge pull request ddnet#9576 from Robyt3/Png-Create-Struct-Error-Handling

Also print errors/warnings for `png_create_read_struct` function

Author: def-

src/engine/gfx/image_loader.cpp

@@ -138,7 +138,12 @@ bool CImageLoader::LoadPng(CByteBufferReader &Reader, const char *pContextName,
 {
 	CUserErrorStruct UserErrorStruct = {&Reader, pContextName, {}};
 
-	png_structp pPngStruct = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
+	if(setjmp(UserErrorStruct.m_JmpBuf))
+	{
+		return false;
+	}
+
+	png_structp pPngStruct = png_create_read_struct(PNG_LIBPNG_VER_STRING, &UserErrorStruct, PngErrorCallback, PngWarningCallback);
 	if(pPngStruct == nullptr)
 	{
 		log_error("png", "libpng internal failure: png_create_read_struct failed.");
@@ -168,7 +173,6 @@ bool CImageLoader::LoadPng(CByteBufferReader &Reader, const char *pContextName,
 		Cleanup();
 		return false;
 	}
-	png_set_error_fn(pPngStruct, &UserErrorStruct, PngErrorCallback, PngWarningCallback);
 
 	pPngInfo = png_create_info_struct(pPngStruct);
 	if(pPngInfo == nullptr)