bareudp: Fixed configuration to avoid having garbage values

Code to initialize the conf structure while gathering the configuration
of the device was missing.

Fixes: 571912c6

 ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Signed-off-by: Martin <martin.varghese@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>