uninitialized memory usage

Hello, to test my fmi-importer I run valgrind against bus.fmu+node.fmu. I found that `resolution` variable (can-bus-simulation/can-bus-simulation/src/[Fmu.c](https://github.com/modelica/fmi-ls-bus-examples/tree/main/can-bus-simulation/src/Fmu.c):423) can be used without initialization.