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/param.h b/arch/x86/include/asm/param.h
index 0009cfb..6f0d042 100644
--- a/arch/x86/include/asm/param.h
+++ b/arch/x86/include/asm/param.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__PARAM_H
-#define ASM_X86__PARAM_H
+#ifndef _ASM_X86_PARAM_H
+#define _ASM_X86_PARAM_H
 
 #ifdef __KERNEL__
 # define HZ		CONFIG_HZ	/* Internal kernel timer frequency */
@@ -19,4 +19,4 @@
 
 #define MAXHOSTNAMELEN	64	/* max length of hostname */
 
-#endif /* ASM_X86__PARAM_H */
+#endif /* _ASM_X86_PARAM_H */