socket.c: allow re-using a context after disconnect

From Adam Endrodi <adam.endrodi@nsn.com>
Fix a bug and clear is_corked during socket disconnect so that we
can re-use the context for a new connection.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

lib/socket.c

@@ -368,6 +368,7 @@ iscsi_disconnect(struct iscsi_context *iscsi)
 
 	iscsi->fd  = -1;
 	iscsi->is_connected = 0;
+	iscsi->is_corked = 0;
 
 	return 0;
 }