gitlab-ci: fix cppcheck errors, warnings and false-positives

.gitlab-ci.yml

libeasy/event.c

libeasy/tests/test_event.c

libeasy/utils.c

libethernet/bcm/bcm.c

libwifi/chlist.c

libwifi/modules/broadcom/bcm.c

libwifi/modules/broadcom/brcm.c

libwifi/modules/broadcom/wlctrl.c

libwifi/modules/intel/intel.c

libwifi/modules/mac80211/mac80211.c

libwifi/modules/nlwifi/nlwifi.c

libwifi/modules/test/test.c

libwifi/modules/wpactrl/wpactrl_util.c

libwifi/util.c

libwifi/wifi.h