Update action.yml

Author: mcbarton

.github/actions/Build_and_Test_CppInterOp/action.yml

@@ -57,7 +57,7 @@ runs:
         else
           cmake --build . --target check-cppinterop --parallel ${{ env.ncpus }}
           os="${{ matrix.os }}"
-          if [[ "${os}" == "macos"* ]]; then
+          if [[ "${os}" != "macos"* ]]; then
             valgrind --show-error-list=yes --track-origins=yes --error-exitcode=1 unittests/CppInterOp/CppInterOpTests/unittests/bin/${{ env.BUILD_TYPE }}/CppInterOpTests
           fi
         fi