Merge pull request #6703 from OlegHahm/cppcheck_fixes

cpu/kinetis_common/periph/rtt.c

cpu/lpc2387/asmfunc.s

cpu/x86/x86_memory.c

cpu/x86/x86_pci.c

cpu/x86/x86_pit.c

dist/tools/ci/build_and_test.sh

dist/tools/cppcheck/check.sh

dist/tools/tunslip/tapslip6.c

dist/tools/tunslip/tunslip.c

dist/tools/tunslip/tunslip6.c

drivers/adt7310/adt7310.c

drivers/hdc1000/hdc1000.c

pkg/nordic_softdevice_ble/src/ble-mac.c

pkg/nordic_softdevice_ble/src/gnrc_nordic_ble_6lowpan.c

sys/cpp11-compat/include/riot/chrono.hpp

sys/cpp11-compat/include/riot/thread.hpp

sys/crypto/chacha.c

sys/crypto/modes/cbc.c

sys/include/xtimer/implementation.h

sys/net/gnrc/conn/udp/gnrc_conn_udp.c