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sdl3: fix now uninitialized surface format pointer

--- a/libnpe_sdl3/surface.c

+++ b/libnpe_sdl3/surface.c

@@ -65,6 +65,9 @@

 		werrstr("SDL_CreateRGBSurface: memory");

 		return nil;

 	}

+	s->format = calloc(1, sizeof(SDL_PixelFormat));

+	s->format->BytesPerPixel = bpp/8;

+	s->format->format = chan2pixel(chan);

 	if(chan == CMAP8){

 		s->i = allocmemimage(Rect(0,0,w,h), screen->chan);

 		s->format->palette = calloc(1, sizeof(SDL_Palette));

-- 

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