core, cpu, drivers, tests: remove trailing space

boards/msba2-common/include/msba2_common.h

core/include/sched.h

cpu/kinetis_common/include/wdog.h

cpu/samd21/periph/i2c.c

cpu/samd21/periph/timer.c

cpu/stm32f4/periph/dac.c

drivers/hdc1000/hdc1000.c

drivers/include/mag3110.h

drivers/include/mpl3115a2.h

drivers/include/periph/dac.h

drivers/include/srf08.h

drivers/nrf24l01p/include/nrf24l01p_settings.h

tests/unittests/tests-ubjson/tests-ubjson.c