HID: thrustmaster use swap() to make code cleaner

Fix the following coccicheck REVIEW:
Use swap() instead of reimplementing it.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: chiminghao <chi.minghao@zte.com.cn>
[bentiss: rewrote commit title]
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20211109082610.131341-1-chi.minghao@zte.com.cn

drivers/hid/hid-tmff.c

@@ -78,7 +78,6 @@ static int tmff_play(struct input_dev *dev, void *data,
 	struct hid_field *ff_field = tmff->ff_field;
 	int x, y;
 	int left, right;	/* Rumbling */
-	int motor_swap;
 
 	switch (effect->type) {
 	case FF_CONSTANT:
@@ -104,11 +103,8 @@ static int tmff_play(struct input_dev *dev, void *data,
 					ff_field->logical_maximum);
 
 		/* 2-in-1 strong motor is left */
-		if (hid->product == THRUSTMASTER_DEVICE_ID_2_IN_1_DT) {
-			motor_swap = left;
-			left = right;
-			right = motor_swap;
-		}
+		if (hid->product == THRUSTMASTER_DEVICE_ID_2_IN_1_DT)
+			swap(left, right);
 
 		dbg_hid("(left,right)=(%08x, %08x)\n", left, right);
 		ff_field->value[0] = left;