Merge pull request #993 from lrh2000/poll-result

Export `PollResult`

src/iface/mod.rs

@@ -18,7 +18,9 @@ mod packet;
 
 #[cfg(feature = "multicast")]
 pub use self::interface::multicast::MulticastError;
-pub use self::interface::{Config, Interface, InterfaceInner as Context};
+pub use self::interface::{
+    Config, Interface, InterfaceInner as Context, PollIngressSingleResult, PollResult,
+};
 
 pub use self::route::{Route, RouteTableFull, Routes};
 pub use self::socket_set::{SocketHandle, SocketSet, SocketStorage};