Assert failure while generating a test case for lz4

[PritamMG]

The following error occurs during the test case generation for lz4:

mtFuzzer: ../src/fuzzHelperFuncStitch.cpp:17: const clang::ast_type_traits::DynTypedNode getBaseParent(const clang::ast_type_traits::DynTypedNode, clang::ASTContext &): Assertion `main_child' failed