frv: fix irqs_disabled() to return an int, not an unsigned long

Fix FRV irqs_disabled() to return an int, not an unsigned long to avoid
this warning:

kernel/sched.c: In function '__might_sleep':
kernel/sched.c:8198: warning: format '%d' expects type 'int', but argument 3 has type 'long unsigned int'
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-frv/system.h

@@ -87,7 +87,7 @@ do {								\
 } while(0)
 
 #define irqs_disabled() \
-	({unsigned long flags; local_save_flags(flags); flags; })
+	({unsigned long flags; local_save_flags(flags); !!flags; })
 
 #define	local_irq_save(flags)			\
 do {						\