Remove static on registrationCb and unregistrationCb.

[mahiuchun]

No description provided.

[codecov]

Codecov Report

Merging #273 (0cd7395) into ign-transport8 (d2b2ccd) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-transport8     #273   +/-   ##
===============================================
  Coverage           83.77%   83.77%           
===============================================
  Files                  51       51           
  Lines                5036     5036           
===============================================
  Hits                 4219     4219           
  Misses                817      817           

Impacted Files	Coverage Δ
include/ignition/transport/Discovery.hh	87.73% <ø> (ø)

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[caguero]

Looks good to me. Thanks for the patch!

It seems that the reason for this was to avoid ABI breakage at some point.

[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-01-10/1228/1

[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-03-25-fortress-edifice-citadel/1343/1