shell: fix condition for ping command
shell: fix condition for ping command

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