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Distinguish MOVE_UNUSED from MOVE_NO_EFFECT in Same Game

--- a/samegame.c

+++ b/samegame.c

@@ -1305,11 +1305,11 @@

 	tx = ui->xsel;

 	ty = ui->ysel;

     } else

-	return NULL;

+	return MOVE_UNUSED;

     if (tx < 0 || tx >= state->params.w || ty < 0 || ty >= state->params.h)

-	return NULL;

-    if (COL(state, tx, ty) == 0) return NULL;

+	return MOVE_UNUSED;

+    if (COL(state, tx, ty) == 0) return MOVE_NO_EFFECT;

     if (ISSEL(ui,tx,ty)) {

 	if (button == RIGHT_BUTTON || button == CURSOR_SELECT2)