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/mach-generic/gpio.h b/arch/x86/include/asm/mach-generic/gpio.h
index 5fef612..995c45e 100644
--- a/arch/x86/include/asm/mach-generic/gpio.h
+++ b/arch/x86/include/asm/mach-generic/gpio.h
@@ -1,5 +1,5 @@
-#ifndef _ASM_X86_MACH_GENERIC__GPIO_H
-#define _ASM_X86_MACH_GENERIC__GPIO_H
+#ifndef _ASM_X86_MACH_GENERIC_GPIO_H
+#define _ASM_X86_MACH_GENERIC_GPIO_H
 
 int gpio_request(unsigned gpio, const char *label);
 void gpio_free(unsigned gpio);
@@ -12,4 +12,4 @@
 
 #include <asm-generic/gpio.h>           /* cansleep wrappers */
 
-#endif /* _ASM_X86_MACH_GENERIC__GPIO_H */
+#endif /* _ASM_X86_MACH_GENERIC_GPIO_H */