pwm: atmel-tcb: Fix typo in comment

Spelling mistake (triple letters) in comment. Detected with the help of
Coccinelle.

Signed-off-by: Julia Lawall <[e-mail]>
Acked-by: Uwe Kleine-König <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

drivers/pwm/pwm-atmel-tcb.c

···
 	/*
 	 * Find best clk divisor:
 	 * the smallest divisor which can fulfill the period_ns requirements.
-	 * If there is a gclk, the first divisor is actuallly the gclk selector
+	 * If there is a gclk, the first divisor is actually the gclk selector
 	 */
 	if (tcbpwmc->gclk)
 		i = 1;