drivers: ethos: fix cast of length parameter
drivers: ethos: fix cast of length parameter

ks156/RIOT,gebart/RIOT,Hyungsin/RIOT-OS,ant9000/RIOT,malosek/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,lazytech-org/RIOT,Josar/RIOT,jremmert-phytec-iot/RIOT,FrancescoErmini/RIOT,altairpearl/RIOT,mtausig/RIOT,attdona/RIOT,hamilton-mote/RIOT-OS,kaspar030/RIOT,neumodisch/RIOT,ks156/RIOT,roberthartung/RIOT,brettswann/RIOT,katezilla/RIOT,malosek/RIOT,zhuoshuguo/RIOT,dkm/RIOT,mfrey/RIOT,mfrey/RIOT,tfar/RIOT,miri64/RIOT,kYc0o/RIOT,plushvoxel/RIOT,dailab/RIOT,LudwigOrtmann/RIOT,jremmert-phytec-iot/RIOT,gebart/RIOT,kaspar030/RIOT,backenklee/RIOT,zhuoshuguo/RIOT,RIOT-OS/RIOT,beurdouche/RIOT,A-Paul/RIOT,adjih/RIOT,asanka-code/RIOT,authmillenon/RIOT,wentaoshang/RIOT,josephnoir/RIOT,dkm/RIOT,thomaseichinger/RIOT,dkm/RIOT,d00616/RIOT,FrancescoErmini/RIOT,gautric/RIOT,miri64/RIOT,rousselk/RIOT,TobiasFredersdorf/RIOT,Josar/RIOT,mtausig/RIOT,basilfx/RIOT,brettswann/RIOT,LudwigKnuepfer/RIOT,OTAkeys/RIOT,TobiasFredersdorf/RIOT,josephnoir/RIOT,avmelnikoff/RIOT,neiljay/RIOT,katezilla/RIOT,dailab/RIOT,wentaoshang/RIOT,roberthartung/RIOT,jasonatran/RIOT,cladmi/RIOT,toonst/RIOT,tfar/RIOT,authmillenon/RIOT,neiljay/RIOT,brettswann/RIOT,dkm/RIOT,aeneby/RIOT,rfuentess/RIOT,asanka-code/RIOT,OTAkeys/RIOT,rfuentess/RIOT,biboc/RIOT,Ell-i/RIOT,brettswann/RIOT,LudwigKnuepfer/RIOT,tfar/RIOT,neumodisch/RIOT,plushvoxel/RIOT,yogo1212/RIOT,tfar/RIOT,kbumsik/RIOT,syin2/RIOT,OTAkeys/RIOT,aeneby/RIOT,beurdouche/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,BytesGalore/RIOT,mfrey/RIOT,authmillenon/RIOT,ant9000/RIOT,rakendrathapa/RIOT,kYc0o/RIOT,miri64/RIOT,gebart/RIOT,RIOT-OS/RIOT,Ell-i/RIOT,jremmert-phytec-iot/RIOT,dkm/RIOT,immesys/RiSyn,basilfx/RIOT,kerneltask/RIOT,kYc0o/RIOT,rajma996/RIOT,A-Paul/RIOT,plushvoxel/RIOT,neiljay/RIOT,mtausig/RIOT,beurdouche/RIOT,A-Paul/RIOT,rajma996/RIOT,thomaseichinger/RIOT,toonst/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,rousselk/RIOT,Josar/RIOT,kbumsik/RIOT,jfischer-phytec-iot/RIOT,brettswann/RIOT,rakendrathapa/RIOT,kerneltask/RIOT,jasonatran/RIOT,avmelnikoff/RIOT,LudwigKnuepfer/RIOT,neumodisch/RIOT,x3ro/RIOT,Hyungsin/RIOT-OS,josephnoir/RIOT,rakendrathapa/RIOT,adjih/RIOT,LudwigKnuepfer/RIOT,ant9000/RIOT,toonst/RIOT,backenklee/RIOT,d00616/RIOT,LudwigOrtmann/RIOT,jbeyerstedt/RIOT-OTA-update,jfischer-phytec-iot/RIOT,alignan/RIOT,smlng/RIOT,adrianghc/RIOT,OlegHahm/RIOT,neiljay/RIOT,biboc/RIOT,hamilton-mote/RIOT-OS,authmillenon/RIOT,aeneby/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,ks156/RIOT,roberthartung/RIOT,plushvoxel/RIOT,miri64/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Josar/RIOT,adrianghc/RIOT,asanka-code/RIOT,avmelnikoff/RIOT,beurdouche/RIOT,dailab/RIOT,kaspar030/RIOT,hamilton-mote/RIOT-OS,x3ro/RIOT,adjih/RIOT,wentaoshang/RIOT,wentaoshang/RIOT,wentaoshang/RIOT,biboc/RIOT,alignan/RIOT,Josar/RIOT,rajma996/RIOT,LudwigOrtmann/RIOT,mtausig/RIOT,lazytech-org/RIOT,x3ro/RIOT,biboc/RIOT,x3ro/RIOT,mfrey/RIOT,backenklee/RIOT,alignan/RIOT,kbumsik/RIOT,smlng/RIOT,LudwigOrtmann/RIOT,authmillenon/RIOT,attdona/RIOT,malosek/RIOT,tfar/RIOT,hamilton-mote/RIOT-OS,jfischer-phytec-iot/RIOT,d00616/RIOT,asanka-code/RIOT,kerneltask/RIOT,LudwigOrtmann/RIOT,OlegHahm/RIOT,jasonatran/RIOT,Ell-i/RIOT,rousselk/RIOT,gebart/RIOT,kaleb-himes/RIOT,adrianghc/RIOT,kbumsik/RIOT,cladmi/RIOT,backenklee/RIOT,lazytech-org/RIOT,kb2ma/RIOT,zhuoshuguo/RIOT,basilfx/RIOT,kaleb-himes/RIOT,katezilla/RIOT,OlegHahm/RIOT,jbeyerstedt/RIOT-OTA-update,gautric/RIOT,FrancescoErmini/RIOT,malosek/RIOT,attdona/RIOT,Hyungsin/RIOT-OS,alignan/RIOT,attdona/RIOT,smlng/RIOT,jbeyerstedt/RIOT-OTA-update,altairpearl/RIOT,mtausig/RIOT,rakendrathapa/RIOT,yogo1212/RIOT,ks156/RIOT,syin2/RIOT,altairpearl/RIOT,Hyungsin/RIOT-OS,rfuentess/RIOT,asanka-code/RIOT,FrancescoErmini/RIOT,OlegHahm/RIOT,LudwigKnuepfer/RIOT,ant9000/RIOT,wentaoshang/RIOT,aeneby/RIOT,jasonatran/RIOT,adjih/RIOT,rousselk/RIOT,lazytech-org/RIOT,rajma996/RIOT,rajma996/RIOT,malosek/RIOT,immesys/RiSyn,zhuoshuguo/RIOT,roberthartung/RIOT,immesys/RiSyn,hamilton-mote/RIOT-OS,rousselk/RIOT,brettswann/RIOT,yogo1212/RIOT,backenklee/RIOT,altairpearl/RIOT,adjih/RIOT,adrianghc/RIOT,smlng/RIOT,thomaseichinger/RIOT,jfischer-phytec-iot/RIOT,plushvoxel/RIOT,ant9000/RIOT,alignan/RIOT,zhuoshuguo/RIOT,rfuentess/RIOT,A-Paul/RIOT,kaspar030/RIOT,jremmert-phytec-iot/RIOT,toonst/RIOT,RIOT-OS/RIOT,jremmert-phytec-iot/RIOT,katezilla/RIOT,ks156/RIOT,basilfx/RIOT,asanka-code/RIOT,kb2ma/RIOT,neiljay/RIOT,rousselk/RIOT,TobiasFredersdorf/RIOT,rakendrathapa/RIOT,BytesGalore/RIOT,thomaseichinger/RIOT,yogo1212/RIOT,x3ro/RIOT,gautric/RIOT,kb2ma/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,biboc/RIOT,josephnoir/RIOT,cladmi/RIOT,RIOT-OS/RIOT,zhuoshuguo/RIOT,kb2ma/RIOT,attdona/RIOT,d00616/RIOT,adrianghc/RIOT,altairpearl/RIOT,altairpearl/RIOT,attdona/RIOT,syin2/RIOT,cladmi/RIOT,rajma996/RIOT,OlegHahm/RIOT,basilfx/RIOT,FrancescoErmini/RIOT,josephnoir/RIOT,neumodisch/RIOT,d00616/RIOT,avmelnikoff/RIOT,dailab/RIOT,kerneltask/RIOT,kerneltask/RIOT,roberthartung/RIOT,jbeyerstedt/RIOT-OTA-update,rakendrathapa/RIOT,kYc0o/RIOT,TobiasFredersdorf/RIOT,LudwigOrtmann/RIOT,jasonatran/RIOT,jfischer-phytec-iot/RIOT,immesys/RiSyn,kb2ma/RIOT,kYc0o/RIOT,smlng/RIOT,kaspar030/RIOT,jremmert-phytec-iot/RIOT,immesys/RiSyn,lazytech-org/RIOT,gebart/RIOT,aeneby/RIOT,BytesGalore/RIOT,gautric/RIOT,BytesGalore/RIOT,neumodisch/RIOT,kaleb-himes/RIOT,dailab/RIOT,rfuentess/RIOT,gautric/RIOT,Ell-i/RIOT,immesys/RiSyn,Hyungsin/RIOT-OS,cladmi/RIOT,A-Paul/RIOT,TobiasFredersdorf/RIOT,kaleb-himes/RIOT,thomaseichinger/RIOT,FrancescoErmini/RIOT,syin2/RIOT,kbumsik/RIOT,avmelnikoff/RIOT,jbeyerstedt/RIOT-OTA-update,d00616/RIOT,miri64/RIOT,katezilla/RIOT,neumodisch/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,syin2/RIOT,kaleb-himes/RIOT,toonst/RIOT,beurdouche/RIOT,yogo1212/RIOT,authmillenon/RIOT,BytesGalore/RIOT,mfrey/RIOT,Ell-i/RIOT,malosek/RIOT