GetTextureSurface: return on invalid physical address early

Previously this check is in GetSurface (if (addr == 0)). This worked fine because GetTextureSurface directly forwarded the address value to GetSurface. However, now with mipmap support, GetTextureSurface would call GetSurface several times with different address offset, resulting some >0 but still invalid address in case the input is 0. We should error out early on invalid address instead of sending it furthor down which would cause invalid memory access

src/video_core/renderer_opengl/gl_rasterizer_cache.cpp

@@ -1332,6 +1332,10 @@ Surface RasterizerCacheOpenGL::GetTextureSurface(
 
 Surface RasterizerCacheOpenGL::GetTextureSurface(const Pica::Texture::TextureInfo& info,
                                                  u32 max_level) {
+    if (info.physical_address == 0) {
+        return nullptr;
+    }
+
     SurfaceParams params;
     params.addr = info.physical_address;
     params.width = info.width;