[ATALK]: Remove gcc warning when PROC_FS=n

Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/atalk.h

@@ -229,7 +229,7 @@ extern void atalk_unregister_sysctl(void);
 extern int atalk_proc_init(void);
 extern void atalk_proc_exit(void);
 #else
-#define atalk_proc_init()	0
+#define atalk_proc_init()	({ 0; })
 #define atalk_proc_exit()	do { } while(0)
 #endif /* CONFIG_PROC_FS */