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SDL_UpdateTexture: fix pitch comparison

--- a/libnpe_sdl2/sdl2.c

+++ b/libnpe_sdl2/sdl2.c

@@ -262,7 +262,7 @@

 	r = re ? Rect(re->x, re->y, re->x+re->w, re->y+re->h) : t->m->r;

 	pix = pixels;

-	if(pitch == Dx(r)){

+	if(pitch == Dx(r)*4){

 		if(loadmemimage(t->m, r, pix, Dx(r)*Dy(r)*4) < 0){

 			werrstr("SDL_UpdateTexture: %r");

 			return -1;