hwmon: (amc6821) fix initialisation

fix checkpatch error:
ERROR: do not initialise statics to 0 or NULL

Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c
index 89a6b9d..4a4bfef 100644
--- a/drivers/hwmon/amc6821.c
+++ b/drivers/hwmon/amc6821.c
@@ -47,7 +47,7 @@
  * Insmod parameters
  */
 
-static int pwminv = 0;	/*Inverted PWM output. */
+static int pwminv;	/*Inverted PWM output. */
 module_param(pwminv, int, S_IRUGO);
 
 static int init = 1; /*Power-on initialization.*/