Fix compile error:
 arch/x86/mm/init_32.c: In function 'mem_init':
 arch/x86/mm/init_32.c:908: error: implicit declaration of function 'start_periodic_check_for_corruption'

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
 include/linux/kernel.h |    4 ++++
 1 file changed, 4 insertions(+)

===================================================================
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -257,6 +257,10 @@
 static inline void check_for_bios_corruption(void)
 {
 }
+
+static inline void start_periodic_check_for_corruption(void)
+{
+}
 #endif
 
 /* Values used for system_state */