x86: sparse warning in therm_throt.c

arch/x86/kernel/cpu/mcheck/therm_throt.c:121:2: warning: returning void-valued expression

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>