hwmon: normal_i2c arrays should be const

Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
diff --git a/drivers/hwmon/ad7418.c b/drivers/hwmon/ad7418.c
index fcd7fe7..466b9ee 100644
--- a/drivers/hwmon/ad7418.c
+++ b/drivers/hwmon/ad7418.c
@@ -26,7 +26,7 @@
 #define DRV_VERSION "0.3"
 
 /* Addresses to scan */
-static unsigned short normal_i2c[] = { 0x28, I2C_CLIENT_END };
+static const unsigned short normal_i2c[] = { 0x28, I2C_CLIENT_END };
 /* Insmod parameters */
 I2C_CLIENT_INSMOD_3(ad7416, ad7417, ad7418);