x86: pageattr.c fix shadowed variable warning

irqs_disabled() uses flags internally, use _flags to avoid shadowing
code calling into this macro.

Introduced between 2.6.25-rc3 and -rc4

Fixes the sparse warning:
arch/x86/mm/pageattr.c:383:21: warning: symbol 'flags' shadows an earlier one
arch/x86/mm/pageattr.c:369:16: originally declared here
Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

include/linux/irqflags.h

@@ -84,10 +84,10 @@
 
 #define irqs_disabled()						\
 ({								\
-	unsigned long flags;					\
+	unsigned long _flags;					\
 								\
-	raw_local_save_flags(flags);				\
-	raw_irqs_disabled_flags(flags);				\
+	raw_local_save_flags(_flags);				\
+	raw_irqs_disabled_flags(_flags);			\
 })
 
 #define irqs_disabled_flags(flags)	raw_irqs_disabled_flags(flags)