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/uv_irq.h b/arch/x86/include/asm/uv/uv_irq.h
index 8502826..9613c8c 100644
--- a/arch/x86/include/asm/uv/uv_irq.h
+++ b/arch/x86/include/asm/uv/uv_irq.h
@@ -8,8 +8,8 @@
  * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
  */
 
-#ifndef _ASM_X86_UV__UV_IRQ_H
-#define _ASM_X86_UV__UV_IRQ_H
+#ifndef _ASM_X86_UV_UV_IRQ_H
+#define _ASM_X86_UV_UV_IRQ_H
 
 /* If a generic version of this structure gets defined, eliminate this one. */
 struct uv_IO_APIC_route_entry {
@@ -33,4 +33,4 @@
 extern int uv_setup_irq(char *, int, int, unsigned long);
 extern void uv_teardown_irq(unsigned int, int, unsigned long);
 
-#endif /* _ASM_X86_UV__UV_IRQ_H */
+#endif /* _ASM_X86_UV_UV_IRQ_H */