bridge: Avoid 'statement with no effect' compiler warnings

Instead of issuing (0) statements when !CONFIG_SYSFS which will cause
'warning: ', we'll use inline statements instead. This will effectively
do the same thing, but suppress any unnecessary warnings.

Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: bridge@lists.linux-foundation.org
Cc: netdev@vger.kernel.org
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_private.h

@@ -570,10 +570,10 @@ extern void br_sysfs_delbr(struct net_device *dev);
 
 #else
 
-#define br_sysfs_addif(p)	(0)
-#define br_sysfs_renameif(p)	(0)
-#define br_sysfs_addbr(dev)	(0)
-#define br_sysfs_delbr(dev)	do { } while(0)
+static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
+static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
+static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
+static inline void br_sysfs_delbr(struct net_device *dev) { return; }
 #endif /* CONFIG_SYSFS */
 
 #endif