tunnel: T9193: keep accepting a lone zero-keyed GRE tunnel on an any source

A GRE tunnel with source-address 0.0.0.0, no remote and "parameters ip key
0" used to commit, but was refused once a zero key stopped counting as a key
for such a tunnel. That breaks existing configurations on upgrade.

Accept it again whenever a key is configured at all. A zero key still cannot
tell two such tunnels apart, and the collision check keeps refusing the
second one, so only the single-tunnel case changes back.

0 files changed, 0 insertions, 0 deletions