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/ptrace.h b/arch/x86/include/asm/ptrace.h
index a202552..d1531c8 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__PTRACE_H
-#define ASM_X86__PTRACE_H
+#ifndef _ASM_X86_PTRACE_H
+#define _ASM_X86_PTRACE_H
 
 #include <linux/compiler.h>	/* For __user */
 #include <asm/ptrace-abi.h>
@@ -277,4 +277,4 @@
 
 #endif /* !__ASSEMBLY__ */
 
-#endif /* ASM_X86__PTRACE_H */
+#endif /* _ASM_X86_PTRACE_H */