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/module.h b/arch/x86/include/asm/module.h
index 864f200..47d6274 100644
--- a/arch/x86/include/asm/module.h
+++ b/arch/x86/include/asm/module.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MODULE_H
-#define ASM_X86__MODULE_H
+#ifndef _ASM_X86_MODULE_H
+#define _ASM_X86_MODULE_H
 
 /* x86_32/64 are simple */
 struct mod_arch_specific {};
@@ -77,4 +77,4 @@
 # define MODULE_ARCH_VERMAGIC MODULE_PROC_FAMILY MODULE_STACKSIZE
 #endif
 
-#endif /* ASM_X86__MODULE_H */
+#endif /* _ASM_X86_MODULE_H */