synaptics-prometheus: Fix tiny memory leak when using FuSynapromConfig
synaptics-prometheus: Fix tiny memory leak when using FuSynapromConfig

hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd