wcn36xx: Fix inconsistent indenting

Eliminate the follow smatch warning:

drivers/net/wireless/ath/wcn36xx/dxe.c:803 wcn36xx_dxe_tx_frame() warn:
inconsistent indenting.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1622024568-32130-1-git-send-email-jiapeng.chong@linux.alibaba.com