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/statfs.h b/arch/x86/include/asm/statfs.h
index ca5dc19..2d0adbf 100644
--- a/arch/x86/include/asm/statfs.h
+++ b/arch/x86/include/asm/statfs.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__STATFS_H
-#define ASM_X86__STATFS_H
+#ifndef _ASM_X86_STATFS_H
+#define _ASM_X86_STATFS_H
 
 /*
  * We need compat_statfs64 to be packed, because the i386 ABI won't
@@ -9,4 +9,4 @@
 #define ARCH_PACK_COMPAT_STATFS64 __attribute__((packed,aligned(4)))
 
 #include <asm-generic/statfs.h>
-#endif /* ASM_X86__STATFS_H */
+#endif /* _ASM_X86_STATFS_H */