ath6kl: fix spelling mistake "initilisation" -> "initialization"

There is a spelling mistake in an ath6kl_err error message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200806121958.60700-1-colin.king@canonical.com

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

@@ -1752,7 +1752,7 @@ static int __ath6kl_init_hw_start(struct ath6kl *ar)
 
 	ret = ath6kl_init_service_ep(ar);
 	if (ret) {
-		ath6kl_err("Endpoint service initilisation failed: %d\n", ret);
+		ath6kl_err("Endpoint service initialization failed: %d\n", ret);
 		goto err_cleanup_scatter;
 	}