bridge: Make IGMP snooping depend upon BRIDGE.

Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/Kconfig

@@ -34,6 +34,7 @@ config BRIDGE
 
 config BRIDGE_IGMP_SNOOPING
 	bool "IGMP snooping"
+	depends on BRIDGE
 	default y
 	---help---
 	  If you say Y here, then the Ethernet bridge will be able selectively