Gigabeat S: Fix a divide by zero in runtime estimation caused by using actual charger current. Use default constant for now.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19584 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/imx31/gigabeat-s/powermgmt-target.h

@@ -100,6 +100,8 @@ void charging_algorithm_close(void);
 /* Provide filtered charge current */
 int battery_charge_current(void);
 
+#if 0
 #define CURRENT_MAX_CHG battery_charge_current()
+#endif
 
 #endif /* POWERMGMT_TARGET_H */