hwmon: (pmbus) Simplify the calculation of variables

Fix the following coccicheck warnings:

./drivers/hwmon/pmbus/pmbus_core.c:1265:24-26: WARNING !A || A && B is
equivalent to !A || B.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Zhong <abaci-bugfix@linux.alibaba.com>
Link: https://lore.kernel.org/r/1611642100-29937-1-git-send-email-abaci-bugfix@linux.alibaba.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pmbus/pmbus_core.c

@@ -1262,7 +1262,7 @@ static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
 		 * which global bit is set) for this page is accessible.
 		 */
 		if (!ret && attr->gbit &&
-		    (!upper || (upper && data->has_status_word)) &&
+		    (!upper || data->has_status_word) &&
 		    pmbus_check_status_register(client, page)) {
 			ret = pmbus_add_boolean(data, name, "alarm", index,
 						NULL, NULL,