ath6kl: replace GFP_ATOMIC with GFP_KERNEL in ath6kl_bmi_init()

ath6kl_bmi_init() is never called in atomic context.
It calls kzalloc() with GFP_ATOMIC, which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.

This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath6kl/bmi.c

@@ -534,7 +534,7 @@ int ath6kl_bmi_init(struct ath6kl *ar)
 	/* cmd + addr + len + data_size */
 	ar->bmi.max_cmd_size = ar->bmi.max_data_size + (sizeof(u32) * 3);
 
-	ar->bmi.cmd_buf = kzalloc(ar->bmi.max_cmd_size, GFP_ATOMIC);
+	ar->bmi.cmd_buf = kzalloc(ar->bmi.max_cmd_size, GFP_KERNEL);
 	if (!ar->bmi.cmd_buf)
 		return -ENOMEM;