qosmngr: consider more warnings as errors and fix discovered issues

This patch series makes compiler consider most warnings as errors, making them more visible. Additionally, most issues reported by compiler are resolved.

assigned to @maximmenshikov

This patch depends on qosmngr fixes from https://dev.iopsys.eu/iopsys/qosmngr/-/merge_requests/12, therefore it cannot be merged before that MR. Note that pipeline fails because of older easy-soc-libs code without Econet QoS changes.

marked this merge request as ready

requested review from @rthakur

assigned to @rthakur and unassigned @maximmenshikov

approved this merge request

merged