x86: fault_32.c cleanup

We get die() from kdebug.h, no need for forward declaration.
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/mm/fault_32.c

@@ -42,8 +42,6 @@
 #define PF_RSVD	(1<<3)
 #define PF_INSTR	(1<<4)
 
-extern void die(const char *, struct pt_regs *, long);
-
 static inline int notify_page_fault(struct pt_regs *regs)
 {
 #ifdef CONFIG_KPROBES