nmi: fix a build error

Note this patch applies against rt:origin/master
I guess it relies on a specific topic but I can't find which one. --
Latest -rt tree fails to build:

arch/x86/kernel/nmi.c: In function ‘nmi_watchdog_tick’:
arch/x86/kernel/nmi.c:463: erreur: implicit declaration of function ‘__profile_tick’ make[1]: *** [arch/x86/kernel/nmi.o] Erreur 1
make: *** [arch/x86/kernel] Erreur 2

nmi.c uses __profile_tick() but lacks its prototype, it needs to include linux/profile.c
Also, __profile_tick() is missing an off case (!CONFIG_PROFILING) on linux/profile.h

---

index c9afd16..4f26868 100644
@@ -26,6 +26,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/kdebug.h>
 #include <linux/smp.h>
+#include <linux/profile.h>
 
 #include <asm/i8259.h>
 #include <asm/io_apic.h>

index 2e1de8a..e440411 100644
@@ -97,6 +97,11 @@ static inline int profile_init(void)
 	return 0;
 }
 
+static inline void __profile_tick(int type, struct pt_regs *regs)
+{
+	return;
+}
+
 static inline void profile_tick(int type)
 {
 	return;

--
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