hwmon: (ltc2978) Fix spelling mistake "comppatible" -> "compatible"

There is a spelling mistake in the module description text, fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pmbus/ltc2978.c

@@ -795,5 +795,5 @@ static struct i2c_driver ltc2978_driver = {
 module_i2c_driver(ltc2978_driver);
 
 MODULE_AUTHOR("Guenter Roeck");
-MODULE_DESCRIPTION("PMBus driver for LTC2978 and comppatible chips");
+MODULE_DESCRIPTION("PMBus driver for LTC2978 and compatible chips");
 MODULE_LICENSE("GPL");