tcp(client/server)src: Fix handling of closed sockets

The peer closing the socket should cause an EOS, instead of
silently doing nothing.  This changes the behavior to be
more like fdsrc.  Fixes: #610386

gst/tcp/gsttcp.c

@@ -284,7 +284,7 @@ ioctl_error:
 got_eos:
   {
     GST_DEBUG_OBJECT (this, "Got EOS on socket stream");
-    return GST_FLOW_WRONG_STATE;
+    return GST_FLOW_UNEXPECTED;
   }
 read_error:
   {