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Distinguish MOVE_UNUSED from MOVE_NO_EFFECT in Flip

--- a/flip.c

+++ b/flip.c

@@ -950,7 +950,7 @@

                             int x, int y, int button)

 {

     int w = state->w, h = state->h, wh = w * h;

-    char buf[80], *nullret = NULL;

+    char buf[80], *nullret = MOVE_UNUSED;

     if (button == LEFT_BUTTON || IS_CURSOR_SELECT(button)) {

         int tx, ty;

@@ -979,7 +979,7 @@

                 sprintf(buf, "M%d,%d", tx, ty);

                 return dupstr(buf);

             } else {

-                return NULL;

+                return MOVE_NO_EFFECT;

             }

         }

     }