log: abis_rsl: don't log 'error' when there is no error

The message 'RF Channel Release due error 0' keeps catching my eye because
it says 'error' even though the error code is zero, i.e. no error.
This shall end now.

Change-Id: Ie0b9d62e8ce85a096c963931e0ae5527b8dc490a
1 file changed
tree: 20149064b586d8b12778638f13d6452e4351667c
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview
  6. .mailmap