core/debug: Fix code style errors
core/debug: Fix code style errors

OTAkeys/RIOT,kaspar030/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,kYc0o/RIOT,basilfx/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,miri64/RIOT,ant9000/RIOT,OTAkeys/RIOT,smlng/RIOT,kaspar030/RIOT,kYc0o/RIOT,basilfx/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,ant9000/RIOT,jasonatran/RIOT,kYc0o/RIOT,jasonatran/RIOT,smlng/RIOT,ant9000/RIOT,jasonatran/RIOT,jasonatran/RIOT,kaspar030/RIOT,OlegHahm/RIOT,yogo1212/RIOT,yogo1212/RIOT,kYc0o/RIOT,smlng/RIOT,authmillenon/RIOT,kaspar030/RIOT,ant9000/RIOT,OTAkeys/RIOT,authmillenon/RIOT,authmillenon/RIOT,basilfx/RIOT,smlng/RIOT,yogo1212/RIOT,basilfx/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,kaspar030/RIOT,ant9000/RIOT,miri64/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,miri64/RIOT,miri64/RIOT,miri64/RIOT,smlng/RIOT,yogo1212/RIOT,basilfx/RIOT,authmillenon/RIOT