Update surface.c

Author: Starbuck5

src_c/surface.c

@@ -869,7 +869,6 @@ static PyObject *
 surf_get_at_mapped(PyObject *self, PyObject *position)
 {
     SDL_Surface *surf = pgSurface_AsSurface(self);
-    SDL_PixelFormat *format = NULL;
     Uint8 *pixels = NULL;
     int x, y;
     Sint32 color;