shell: commands: ping6: fix operator order for casting
shell: commands: ping6: fix operator order for casting

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