sca: Fix undefined behavior during preprocessing

According to the C standard it is undefined behavior to use preprocessor
directives inside macro invocations.

Cppcheck stops when it see this UB with an error message, and so this
change will improve Cppcheck analysis

This is a refactoring to fix UB, no logical change is intended.

Signed-off-by: Daniel Marjamäki <daniel.marjamaki@cppchecksolutions.com>