net_uv: pipes don't have getsockname

lib/net_uv.js

@@ -70,9 +70,11 @@ function initSocketHandle(self) {
     self._handle.socket = self;
     self._handle.onread = onread;
 
+    if (self._handle.getsockname) {
       var sockname = self._handle.getsockname();
       self.remoteAddress = sockname.address;
       self.remotePort = sockname.port;
+    }
     // also export sockname.family?
   }
 }