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/unaligned.h b/arch/x86/include/asm/unaligned.h
index 59dcdec..a7bd416 100644
--- a/arch/x86/include/asm/unaligned.h
+++ b/arch/x86/include/asm/unaligned.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__UNALIGNED_H
-#define ASM_X86__UNALIGNED_H
+#ifndef _ASM_X86_UNALIGNED_H
+#define _ASM_X86_UNALIGNED_H
 
 /*
  * The x86 can do unaligned accesses itself.
@@ -11,4 +11,4 @@
 #define get_unaligned __get_unaligned_le
 #define put_unaligned __put_unaligned_le
 
-#endif /* ASM_X86__UNALIGNED_H */
+#endif /* _ASM_X86_UNALIGNED_H */