cppcheck: Fix unreachableCode in test-menu-parser

correctmostrequested to merge
correctmost/garcon:cm/fix-unreachable-warning into master

This warning appeared when running cppcheck with --inconclusive:

tests/test-menu-parser.c:313:15: style: inconclusive: Statements following noreturn function 'g_error()' will never be executed. [unreachableCode]

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