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f537b30c86
This fixes a case where the px4 startup is not stopped when the px4 process is killled using -SIGKILL against the px4 deamon. In that case, the currently executing command/client is killed and properly shutting down with result -1, however, the next command is started anyway. This means that the next time we try to run the simulation we get a "PX4 daemon already running for instance 0" error and PX4 doesn't start properly. By adding exit on error, we properly exit in the case where the startup script gets stopped/killed.