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/uaccess_32.h b/arch/x86/include/asm/uaccess_32.h
index 6b5b57d..d095a3a 100644
--- a/arch/x86/include/asm/uaccess_32.h
+++ b/arch/x86/include/asm/uaccess_32.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__UACCESS_32_H
-#define ASM_X86__UACCESS_32_H
+#ifndef _ASM_X86_UACCESS_32_H
+#define _ASM_X86_UACCESS_32_H
 
 /*
  * User space memory access functions
@@ -215,4 +215,4 @@
 unsigned long __must_check clear_user(void __user *mem, unsigned long len);
 unsigned long __must_check __clear_user(void __user *mem, unsigned long len);
 
-#endif /* ASM_X86__UACCESS_32_H */
+#endif /* _ASM_X86_UACCESS_32_H */