dist/tools/tunslip6: Fix off by one on index in is_sensible_string
dist/tools/tunslip6: Fix off by one on index in is_sensible_string

avmelnikoff/RIOT,rfuentess/RIOT,Josar/RIOT,josephnoir/RIOT,katezilla/RIOT,kaspar030/RIOT,neiljay/RIOT,jfischer-phytec-iot/RIOT,Hyungsin/RIOT-OS,neumodisch/RIOT,aeneby/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,jbeyerstedt/RIOT-OTA-update,neumodisch/RIOT,jbeyerstedt/RIOT-OTA-update,kYc0o/RIOT,immesys/RiSyn,thomaseichinger/RIOT,immesys/RiSyn,yogo1212/RIOT,katezilla/RIOT,neumodisch/RIOT,rfuentess/RIOT,biboc/RIOT,kbumsik/RIOT,kb2ma/RIOT,beurdouche/RIOT,OlegHahm/RIOT,rfuentess/RIOT,LudwigKnuepfer/RIOT,lazytech-org/RIOT,aeneby/RIOT,basilfx/RIOT,jfischer-phytec-iot/RIOT,Ell-i/RIOT,BytesGalore/RIOT,gautric/RIOT,backenklee/RIOT,kaleb-himes/RIOT,toonst/RIOT,josephnoir/RIOT,x3ro/RIOT,dailab/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,ks156/RIOT,OTAkeys/RIOT,smlng/RIOT,jfischer-phytec-iot/RIOT,authmillenon/RIOT,immesys/RiSyn,immesys/RiSyn,BytesGalore/RIOT,roberthartung/RIOT,plushvoxel/RIOT,OTAkeys/RIOT,thomaseichinger/RIOT,gebart/RIOT,x3ro/RIOT,biboc/RIOT,A-Paul/RIOT,TobiasFredersdorf/RIOT,immesys/RiSyn,jbeyerstedt/RIOT-OTA-update,gebart/RIOT,yogo1212/RIOT,yogo1212/RIOT,adjih/RIOT,ant9000/RIOT,kaspar030/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,miri64/RIOT,syin2/RIOT,neiljay/RIOT,jasonatran/RIOT,LudwigKnuepfer/RIOT,miri64/RIOT,toonst/RIOT,mtausig/RIOT,neiljay/RIOT,katezilla/RIOT,smlng/RIOT,neumodisch/RIOT,roberthartung/RIOT,kbumsik/RIOT,basilfx/RIOT,katezilla/RIOT,basilfx/RIOT,ant9000/RIOT,toonst/RIOT,syin2/RIOT,kYc0o/RIOT,LudwigKnuepfer/RIOT,lazytech-org/RIOT,authmillenon/RIOT,OTAkeys/RIOT,Josar/RIOT,mtausig/RIOT,biboc/RIOT,TobiasFredersdorf/RIOT,ant9000/RIOT,jasonatran/RIOT,roberthartung/RIOT,backenklee/RIOT,thomaseichinger/RIOT,kYc0o/RIOT,A-Paul/RIOT,mtausig/RIOT,Ell-i/RIOT,roberthartung/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,beurdouche/RIOT,Hyungsin/RIOT-OS,OlegHahm/RIOT,hamilton-mote/RIOT-OS,adjih/RIOT,lazytech-org/RIOT,kerneltask/RIOT,smlng/RIOT,kbumsik/RIOT,aeneby/RIOT,ks156/RIOT,LudwigKnuepfer/RIOT,dailab/RIOT,biboc/RIOT,lazytech-org/RIOT,adrianghc/RIOT,gautric/RIOT,avmelnikoff/RIOT,gebart/RIOT,adrianghc/RIOT,thomaseichinger/RIOT,kaspar030/RIOT,aeneby/RIOT,OlegHahm/RIOT,ant9000/RIOT,Josar/RIOT,cladmi/RIOT,TobiasFredersdorf/RIOT,biboc/RIOT,Ell-i/RIOT,kb2ma/RIOT,jbeyerstedt/RIOT-OTA-update,LudwigOrtmann/RIOT,gebart/RIOT,adjih/RIOT,kYc0o/RIOT,ks156/RIOT,kerneltask/RIOT,kerneltask/RIOT,RIOT-OS/RIOT,ks156/RIOT,kerneltask/RIOT,ant9000/RIOT,cladmi/RIOT,LudwigOrtmann/RIOT,lazytech-org/RIOT,kaleb-himes/RIOT,LudwigOrtmann/RIOT,miri64/RIOT,backenklee/RIOT,adrianghc/RIOT,rfuentess/RIOT,katezilla/RIOT,josephnoir/RIOT,dkm/RIOT,Josar/RIOT,Hyungsin/RIOT-OS,kbumsik/RIOT,mfrey/RIOT,beurdouche/RIOT,aeneby/RIOT,dkm/RIOT,plushvoxel/RIOT,OTAkeys/RIOT,roberthartung/RIOT,kb2ma/RIOT,jfischer-phytec-iot/RIOT,Hyungsin/RIOT-OS,authmillenon/RIOT,yogo1212/RIOT,josephnoir/RIOT,plushvoxel/RIOT,RIOT-OS/RIOT,dkm/RIOT,TobiasFredersdorf/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,mtausig/RIOT,kbumsik/RIOT,adjih/RIOT,jasonatran/RIOT,ks156/RIOT,RIOT-OS/RIOT,avmelnikoff/RIOT,rfuentess/RIOT,gebart/RIOT,OlegHahm/RIOT,kb2ma/RIOT,A-Paul/RIOT,kaleb-himes/RIOT,dailab/RIOT,plushvoxel/RIOT,hamilton-mote/RIOT-OS,TobiasFredersdorf/RIOT,gautric/RIOT,Hyungsin/RIOT-OS,authmillenon/RIOT,jasonatran/RIOT,syin2/RIOT,dailab/RIOT,miri64/RIOT,gautric/RIOT,hamilton-mote/RIOT-OS,dailab/RIOT,syin2/RIOT,smlng/RIOT,hamilton-mote/RIOT-OS,plushvoxel/RIOT,backenklee/RIOT,josephnoir/RIOT,kerneltask/RIOT,cladmi/RIOT,BytesGalore/RIOT,kaleb-himes/RIOT,cladmi/RIOT,authmillenon/RIOT,LudwigKnuepfer/RIOT,OTAkeys/RIOT,LudwigOrtmann/RIOT,smlng/RIOT,cladmi/RIOT,neiljay/RIOT,syin2/RIOT,immesys/RiSyn,Ell-i/RIOT,yogo1212/RIOT,jfischer-phytec-iot/RIOT,x3ro/RIOT,adjih/RIOT,miri64/RIOT,neumodisch/RIOT,hamilton-mote/RIOT-OS,RIOT-OS/RIOT,BytesGalore/RIOT,mfrey/RIOT,dkm/RIOT,avmelnikoff/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,adrianghc/RIOT,mfrey/RIOT,dkm/RIOT,Ell-i/RIOT,kYc0o/RIOT,toonst/RIOT,kaleb-himes/RIOT,neiljay/RIOT,OlegHahm/RIOT,Josar/RIOT,BytesGalore/RIOT,mfrey/RIOT,LudwigOrtmann/RIOT,avmelnikoff/RIOT,kaspar030/RIOT,A-Paul/RIOT,beurdouche/RIOT,adrianghc/RIOT,mtausig/RIOT,LudwigOrtmann/RIOT,mfrey/RIOT,x3ro/RIOT,kb2ma/RIOT,x3ro/RIOT,authmillenon/RIOT,kaspar030/RIOT,thomaseichinger/RIOT,basilfx/RIOT,jbeyerstedt/RIOT-OTA-update,gautric/RIOT,basilfx/RIOT,jasonatran/RIOT,A-Paul/RIOT,toonst/RIOT,neumodisch/RIOT,backenklee/RIOT,beurdouche/RIOT