[PATCH] ath: Remove unneeded variable

[baomingtong001@208suo.com]

Fix the following coccicheck warning:

drivers/net/wireless/ath/ath9k/gpio.c:501:5-8: Unneeded variable: "len".

Signed-off-by: Mingtong Bao <baomingtong001@208suo.com>
---
  drivers/net/wireless/ath/ath9k/gpio.c | 3 +--
  1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/gpio.c 
b/drivers/net/wireless/ath/ath9k/gpio.c
index b457e52dd365..f3d1bc02e633 100644
--- a/drivers/net/wireless/ath/ath9k/gpio.c
+++ b/drivers/net/wireless/ath/ath9k/gpio.c
@@ -498,14 +498,13 @@ static int ath9k_dump_legacy_btcoex(struct 
ath_softc *sc, u8 *buf, u32 size)
  {

      struct ath_btcoex *btcoex = &sc->btcoex;
-    u32 len = 0;

      ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
      ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
      ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
      ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);

-    return len;
+    return 0;
  }

  int ath9k_dump_btcoex(struct ath_softc *sc, u8 *buf, u32 size)