hwmon: (nct6775) Fix comment in the description of pwm_mode

Commit 415eb2a1 ("hwmon: (nct6775) Fix writing pwmX_mode") changed
the definition of the pwm_mode variable, but did not update the comment
describing it.
Reported-by: NBen Hutchings <ben.hutchings@codethink.co.uk>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>

drivers/hwmon/nct6775.c

@@ -1050,8 +1050,8 @@ struct nct6775_data {
 	u64 beeps;
 
 	u8 pwm_num;	/* number of pwm */
-	u8 pwm_mode[NUM_FAN];	/* 1->DC variable voltage,
-				 * 0->PWM variable duty cycle
+	u8 pwm_mode[NUM_FAN];	/* 0->DC variable voltage,
+				 * 1->PWM variable duty cycle
 				 */
 	enum pwm_enable pwm_enable[NUM_FAN];
 			/* 0->off