[Coverity CID :186058] Null pointer dereferences in /tests/kernel/fifo/fifo_timeout/src/main.c

[mandarcthorat1]

Static code scan issues seen in File: /tests/kernel/fifo/fifo_timeout/src/main.c
Category: Null pointer dereferences
Function: test_multiple_threads_get_data
Component: Tests
CID: 186058
Please fix or provide comments to square it off in coverity in the link: https://scan9.coverity.com/reports.htm#v32951/p12996