[Coverity CID :197600]Incorrect expression in /tests/lib/c_lib/src/main.c

[aasthagr]

Static code scan issues seen in File: /tests/lib/c_lib/src/main.c
Category: Incorrect expression
Function: test_stddef
Component: Tests
CID: 197600
Please fix or provide comments to square it off in coverity in the link: https://scan9.coverity.com/reports.htm#v32951/p12996

[nashif]

/**
 79 *
 80 * @brief Test standard type definitions library
 81 *
 82 */
 83
 84void test_stddef(void)
 85{
 86
   	
CID 197600 (#1 of 1): Side effect in assertion (ASSERT_SIDE_EFFECT)
assert_side_effect: Argument size_of_long_variable of z_zassert() has a side effect because the variable is volatile. The containing function might work differently in a non-debug build.
 87        zassert_true((size_of_long_variable == 4), "sizeof");
 88}
 89