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/calgary.h b/arch/x86/include/asm/calgary.h
index 933fd27..b03bedb 100644
--- a/arch/x86/include/asm/calgary.h
+++ b/arch/x86/include/asm/calgary.h
@@ -21,8 +21,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
 
-#ifndef ASM_X86__CALGARY_H
-#define ASM_X86__CALGARY_H
+#ifndef _ASM_X86_CALGARY_H
+#define _ASM_X86_CALGARY_H
 
 #include <linux/spinlock.h>
 #include <linux/device.h>
@@ -69,4 +69,4 @@
 static inline void detect_calgary(void) { return; }
 #endif
 
-#endif /* ASM_X86__CALGARY_H */
+#endif /* _ASM_X86_CALGARY_H */