x86: drop double underscores from header guards

Drop double underscores from header guards in arch/x86/include.  They
are used inconsistently, and are not necessary.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/include/asm/uv/bios.h b/arch/x86/include/asm/uv/bios.h
index 2836439..d931d3b 100644
--- a/arch/x86/include/asm/uv/bios.h
+++ b/arch/x86/include/asm/uv/bios.h
@@ -1,5 +1,5 @@
-#ifndef _ASM_X86_UV__BIOS_H
-#define _ASM_X86_UV__BIOS_H
+#ifndef _ASM_X86_UV_BIOS_H
+#define _ASM_X86_UV_BIOS_H
 
 /*
  * UV BIOS layer definitions.
@@ -91,4 +91,4 @@
 
 extern struct kobject *sgi_uv_kobj;	/* /sys/firmware/sgi_uv */
 
-#endif /* _ASM_X86_UV__BIOS_H */
+#endif /* _ASM_X86_UV_BIOS_H */