Even More O3 fixes
fix build warnings to compile with linaro -Ofast optimization

Conflicts:
	drivers/media/common/tuners/xc4000.c
	drivers/power/pm8921-bms-htc.c
	drivers/power/pm8921-charger-htc.c
	fs/namei.c
	net/unix/af_unix.c
	sound/usb/mixer.c