[Coverity CID :197603]Incorrect expression in /tests/kernel/fatal/src/main.c

[aasthagr]

Static code scan issues seen in File: /tests/kernel/fatal/src/main.c
Category: Incorrect expression
Function: test_fatal
Component: Tests
CID: 197603
Please fix or provide comments to square it off in coverity in the link: https://scan9.coverity.com/reports.htm#v32951/p12996