[Coverity CID :185397] Null pointer dereferences in /tests/net/ipv6_fragment/src/main.c

[Shilpashree3lc-zz]

Static code scan issues seen in File: /tests/net/ipv6_fragment/src/main.c
Category: Null pointer dereferences
Function: test_setup
Component: Tests
CID: 185397
Please fix or provide comments to square it off in coverity in the link: https://scan9.coverity.com/reports.htm#v32951/p12996