x86: Fix ASM_X86__ header guards

Change header guards named "ASM_X86__*" to "_ASM_X86_*" since:

a. the double underscore is ugly and pointless.
b. no leading underscore violates namespace constraints.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/include/asm/kprobes.h b/arch/x86/include/asm/kprobes.h
index 8a0748d..4fe681d 100644
--- a/arch/x86/include/asm/kprobes.h
+++ b/arch/x86/include/asm/kprobes.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__KPROBES_H
-#define ASM_X86__KPROBES_H
+#ifndef _ASM_X86_KPROBES_H
+#define _ASM_X86_KPROBES_H
 /*
  *  Kernel Probes (KProbes)
  *
@@ -85,4 +85,4 @@
 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 extern int kprobe_exceptions_notify(struct notifier_block *self,
 				    unsigned long val, void *data);
-#endif /* ASM_X86__KPROBES_H */
+#endif /* _ASM_X86_KPROBES_H */