Freeciv

mac-meson CI build is giving -Wtautological-pointer-compare:

../client/mapview_common.c:1914:7: error: comparison of nonnull parameter 'width' not equal to a null pointer is 'true' on first encounter [-Werror,-Wtautological-pointer-compare]
  if (width != NULL) {
      ^~~~~    ~~~~
../client/mapview_common.c:90:18: note: declared 'nonnull' here
  fc__attribute((nonnull(5, 6)));
                 ^
../client/mapview_common.c:1917:7: error: comparison of nonnull parameter 'height' not equal to a null pointer is 'true' on first encounter [-Werror,-Wtautological-pointer-compare]
  if (height != NULL) {
      ^~~~~~    ~~~~
../client/mapview_common.c:90:18: note: declared 'nonnull' here
  fc__attribute((nonnull(5, 6)));
                 ^
2 errors generated.