Fix no-return-in-nonvoid-function meas_vis.c

RPM post-build-checks found some issue and marks these as error:

[   38s] I: Program returns random data in a function
[   38s] E: openbsc no-return-in-nonvoid-function meas_vis.c:118
1 file changed
tree: 20bad0da4e66211a015c63b19152897fe06b973b
  1. debian/
  2. hlrsync/
  3. linux-kernel/
  4. openbsc/
  5. wireshark/
  6. .gitignore