gnrc_rpl_srh: give variables more speaking names
gnrc_rpl_srh: give variables more speaking names

authmillenon/RIOT,yogo1212/RIOT,rfuentess/RIOT,BytesGalore/RIOT,miri64/RIOT,biboc/RIOT,toonst/RIOT,authmillenon/RIOT,authmillenon/RIOT,lazytech-org/RIOT,josephnoir/RIOT,ant9000/RIOT,BytesGalore/RIOT,yogo1212/RIOT,kaspar030/RIOT,mfrey/RIOT,RIOT-OS/RIOT,gebart/RIOT,RIOT-OS/RIOT,smlng/RIOT,basilfx/RIOT,ant9000/RIOT,BytesGalore/RIOT,OlegHahm/RIOT,yogo1212/RIOT,miri64/RIOT,josephnoir/RIOT,gebart/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,ant9000/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,x3ro/RIOT,x3ro/RIOT,josephnoir/RIOT,biboc/RIOT,aeneby/RIOT,aeneby/RIOT,kYc0o/RIOT,rfuentess/RIOT,OlegHahm/RIOT,basilfx/RIOT,miri64/RIOT,yogo1212/RIOT,cladmi/RIOT,mfrey/RIOT,cladmi/RIOT,kaspar030/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,rfuentess/RIOT,josephnoir/RIOT,mfrey/RIOT,yogo1212/RIOT,ant9000/RIOT,gebart/RIOT,lazytech-org/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,cladmi/RIOT,kYc0o/RIOT,basilfx/RIOT,BytesGalore/RIOT,toonst/RIOT,gebart/RIOT,cladmi/RIOT,kYc0o/RIOT,OlegHahm/RIOT,toonst/RIOT,mtausig/RIOT,kYc0o/RIOT,OlegHahm/RIOT,authmillenon/RIOT,mtausig/RIOT,jasonatran/RIOT,aeneby/RIOT,kaspar030/RIOT,BytesGalore/RIOT,lazytech-org/RIOT,x3ro/RIOT,authmillenon/RIOT,basilfx/RIOT,aeneby/RIOT,rfuentess/RIOT,biboc/RIOT,toonst/RIOT,biboc/RIOT,mfrey/RIOT,A-Paul/RIOT,A-Paul/RIOT,mtausig/RIOT,smlng/RIOT,miri64/RIOT,cladmi/RIOT,toonst/RIOT,kYc0o/RIOT,mtausig/RIOT,jasonatran/RIOT,miri64/RIOT,x3ro/RIOT,rfuentess/RIOT,OTAkeys/RIOT,x3ro/RIOT,basilfx/RIOT,smlng/RIOT,smlng/RIOT,jasonatran/RIOT,A-Paul/RIOT,OTAkeys/RIOT,mfrey/RIOT,gebart/RIOT,kaspar030/RIOT,ant9000/RIOT,aeneby/RIOT,smlng/RIOT,A-Paul/RIOT,A-Paul/RIOT,mtausig/RIOT,lazytech-org/RIOT,biboc/RIOT,jasonatran/RIOT,authmillenon/RIOT,josephnoir/RIOT