Get rid of GCC 4.8 warning-errors properly.
	modified:   Makefile
	modified:   arch/arm/mach-msm/semc_charger_usb.c
	modified:   drivers/power/battery_chargalg.c
	modified:   drivers/power/bq27520_battery.c
	modified:   drivers/usb/gadget/f_qdss.c
	modified:   kernel/timeconst.pl
	modified:   mm/slub.c
	modified:   net/bluetooth/hci_conn.c

Change-Id: Ia266c7db2ef34709b59b8b4d004a9ca1d263956f