abis_nm: Fix possible not-null-terminated buffer

Unrealistic case with file name of 4096 bytes length.

Change-Id: I503200b879b854cf2dc218d5fe3059a555732d92
Fixes: Coverity CID 57619
1 file changed
tree: d722479fe0dcba7f7079a1fc42b13e92025ceaa3
  1. contrib/
  2. debian/
  3. openbsc/
  4. .gitignore
  5. .gitreview
  6. .mailmap