ds2780_battery&z2_battery: Add __devexit_p at necessary places

According to the comments in include/linux/init.h:

"Pointers to __devexit functions must use __devexit_p(function_name), the
wrapper will insert either the function_name or NULL, depending on the config
options."

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Cc: Clifton Barnes <cabarnes@indesign-llc.com>
Cc: Peter Edwards <sweetlilmre@gmail.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
diff --git a/drivers/power/ds2780_battery.c b/drivers/power/ds2780_battery.c
index 1fefe82..ed25ef5 100644
--- a/drivers/power/ds2780_battery.c
+++ b/drivers/power/ds2780_battery.c
@@ -832,7 +832,7 @@
 		.name = "ds2780-battery",
 	},
 	.probe	  = ds2780_battery_probe,
-	.remove   = ds2780_battery_remove,
+	.remove   = __devexit_p(ds2780_battery_remove),
 };
 
 static int __init ds2780_battery_init(void)