Change in osmo-ggsn[master]: apn_start: avoid segfault if missing tun-device

[osmith]

Hello Jenkins Builder, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/c/osmo-ggsn/+/22732

to look at the new patch set (#2).

Change subject: apn_start: avoid segfault if missing tun-device
......................................................................

apn_start: avoid segfault if missing tun-device

Check if tun-device is defined and give the user a hint that it is
missing instead of segfaulting with gtpu-mode kernel-gtp:
  20210205141701206 DGGSN <0002> ggsn.c:186 APN(internet): Starting
  20210205141701206 DGGSN <0002> ggsn.c:204 APN(internet): Opening Kernel GTP device (null)
  Segmentation fault

With gtpu-mode tun it didn't segfault, but still tried to open the NULL
device:
  20210205141557598 DGGSN <0002> ggsn.c:186 APN(internet): Starting
  20210205141557599 DGGSN <0002> ggsn.c:189 APN(internet): Opening TUN device (null)
  20210205141557599 DTUN <0001> tun.c:195 errno=1/Operation not permitted ioctl() failed

Related: OS#3208
Change-Id: I9f71af65cc0eed71728c04b774e5c08352947913
---
M ggsn/ggsn_vty.c
1 file changed, 4 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-ggsn refs/changes/32/22732/2
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Gerrit-Project: osmo-ggsn
Gerrit-Branch: master
Gerrit-Change-Id: I9f71af65cc0eed71728c04b774e5c08352947913
Gerrit-Change-Number: 22732
Gerrit-PatchSet: 2
Gerrit-Owner: osmith <osmith at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-CC: pespin <pespin at sysmocom.de>
Gerrit-MessageType: newpatchset
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