removed redundant check

+ Fixes warning with newer versions of gcc

hid-tmff2.c

@@ -409,7 +409,7 @@ static int tmff2_play(struct input_dev *dev, int effect_id, int value)
 		return -ENODEV;
 
 	state = &tmff2->states[effect_id];
-	if (&state->effect == 0)
+	if (!state)
 		return 0;
 
 	spin_lock(&tmff2->lock);