gsm_trx_name(): don't break if trx is NULL

Just as a general precaution deemed to fit such a convenience function that
lives in libcommon, no actual failure observed.

Change-Id: I8e77fe1abc402469fd037e2fde2f46e2c8114f59
1 file changed
tree: db05821a48ed9ad29ef624cdad5c5ba40b2b593b
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview
  6. .mailmap