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/bugs.h b/arch/x86/include/asm/bugs.h
index dc60498..08abf63 100644
--- a/arch/x86/include/asm/bugs.h
+++ b/arch/x86/include/asm/bugs.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__BUGS_H
-#define ASM_X86__BUGS_H
+#ifndef _ASM_X86_BUGS_H
+#define _ASM_X86_BUGS_H
 
 extern void check_bugs(void);
 
@@ -9,4 +9,4 @@
 static inline int ppro_with_ram_bug(void) { return 0; }
 #endif
 
-#endif /* ASM_X86__BUGS_H */
+#endif /* _ASM_X86_BUGS_H */