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sys: net: gnrc_netreg: check for msg queue of registered thread, not registering

Ell-i/RIOT,RIOT-OS/RIOT,hamilton-mote/RIOT-OS,d00616/RIOT,dailab/RIOT,adjih/RIOT,LudwigOrtmann/RIOT,MohmadAyman/RIOT,avmelnikoff/RIOT,mziegert/RIOT,binarylemon/RIOT,d00616/RIOT,asanka-code/RIOT,lebrush/RIOT,toonst/RIOT,BytesGalore/RIOT,kYc0o/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,authmillenon/RIOT,jbeyerstedt/RIOT-OTA-update,asanka-code/RIOT,josephnoir/RIOT,cladmi/RIOT,mfrey/RIOT,roberthartung/RIOT,dailab/RIOT,roberthartung/RIOT,altairpearl/RIOT,authmillenon/RIOT,rfuentess/RIOT,RBartz/RIOT,neumodisch/RIOT,FrancescoErmini/RIOT,adrianghc/RIOT,tfar/RIOT,stevenj/RIOT,Yonezawa-T2/RIOT,immesys/RiSyn,herrfz/RIOT,BytesGalore/RIOT,zhuoshuguo/RIOT,MohmadAyman/RIOT,Yonezawa-T2/RIOT,RubikonAlpha/RIOT,A-Paul/RIOT,basilfx/RIOT,FrancescoErmini/RIOT,neumodisch/RIOT,stevenj/RIOT,kYc0o/RIOT,TobiasFredersdorf/RIOT,rajma996/RIOT,rousselk/RIOT,kYc0o/RIOT,syin2/RIOT,miri64/RIOT,biboc/RIOT,lebrush/RIOT,Yonezawa-T2/RIOT,hamilton-mote/RIOT-OS,toonst/RIOT,rajma996/RIOT,smlng/RIOT,ks156/RIOT,neumodisch/RIOT,ant9000/RIOT,katezilla/RIOT,Ell-i/RIOT,rakendrathapa/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,lazytech-org/RIOT,aeneby/RIOT,RubikonAlpha/RIOT,jremmert-phytec-iot/RIOT,wentaoshang/RIOT,avmelnikoff/RIOT,OTAkeys/RIOT,d00616/RIOT,biboc/RIOT,Hyungsin/RIOT-OS,malosek/RIOT,khhhh/RIOT,Ell-i/RIOT,brettswann/RIOT,Josar/RIOT,d00616/RIOT,dkm/RIOT,immesys/RiSyn,stevenj/RIOT,thomaseichinger/RIOT,yogo1212/RIOT,x3ro/RIOT,aeneby/RIOT,kaleb-himes/RIOT,l3nko/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,lebrush/RIOT,TobiasFredersdorf/RIOT,A-Paul/RIOT,thomaseichinger/RIOT,dailab/RIOT,ant9000/RIOT,dkm/RIOT,malosek/RIOT,wentaoshang/RIOT,shady33/RIOT,alignan/RIOT,kb2ma/RIOT,backenklee/RIOT,BytesGalore/RIOT,Yonezawa-T2/RIOT,smlng/RIOT,attdona/RIOT,kerneltask/RIOT,avmelnikoff/RIOT,Hyungsin/RIOT-OS,ant9000/RIOT,mfrey/RIOT,brettswann/RIOT,wentaoshang/RIOT,mfrey/RIOT,RIOT-OS/RIOT,RBartz/RIOT,Josar/RIOT,A-Paul/RIOT,asanka-code/RIOT,x3ro/RIOT,dhruvvyas90/RIOT,altairpearl/RIOT,rajma996/RIOT,binarylemon/RIOT,rajma996/RIOT,gebart/RIOT,roberthartung/RIOT,A-Paul/RIOT,FrancescoErmini/RIOT,khhhh/RIOT,katezilla/RIOT,rousselk/RIOT,altairpearl/RIOT,mziegert/RIOT,d00616/RIOT,rousselk/RIOT,tfar/RIOT,RBartz/RIOT,biboc/RIOT,jasonatran/RIOT,adjih/RIOT,dhruvvyas90/RIOT,gautric/RIOT,adrianghc/RIOT,neiljay/RIOT,smlng/RIOT,Ell-i/RIOT,rousselk/RIOT,shady33/RIOT,kaspar030/RIOT,attdona/RIOT,authmillenon/RIOT,attdona/RIOT,dkm/RIOT,rousselk/RIOT,Yonezawa-T2/RIOT,asanka-code/RIOT,jasonatran/RIOT,jremmert-phytec-iot/RIOT,rakendrathapa/RIOT,shady33/RIOT,stevenj/RIOT,jbeyerstedt/RIOT-OTA-update,BytesGalore/RIOT,hamilton-mote/RIOT-OS,plushvoxel/RIOT,lebrush/RIOT,adrianghc/RIOT,ks156/RIOT,josephnoir/RIOT,jbeyerstedt/RIOT-OTA-update,rousselk/RIOT,mtausig/RIOT,toonst/RIOT,dailab/RIOT,gebart/RIOT,RBartz/RIOT,brettswann/RIOT,yogo1212/RIOT,dkm/RIOT,mtausig/RIOT,brettswann/RIOT,mtausig/RIOT,jasonatran/RIOT,stevenj/RIOT,Hyungsin/RIOT-OS,OlegHahm/RIOT,toonst/RIOT,OlegHahm/RIOT,kerneltask/RIOT,adjih/RIOT,neiljay/RIOT,syin2/RIOT,A-Paul/RIOT,gautric/RIOT,RIOT-OS/RIOT,stevenj/RIOT,herrfz/RIOT,shady33/RIOT,miri64/RIOT,MohmadAyman/RIOT,malosek/RIOT,l3nko/RIOT,jremmert-phytec-iot/RIOT,RubikonAlpha/RIOT,shady33/RIOT,kaspar030/RIOT,LudwigKnuepfer/RIOT,gautric/RIOT,yogo1212/RIOT,alignan/RIOT,alignan/RIOT,kbumsik/RIOT,khhhh/RIOT,Ell-i/RIOT,mtausig/RIOT,neiljay/RIOT,attdona/RIOT,roberthartung/RIOT,kaspar030/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,avmelnikoff/RIOT,ks156/RIOT,dhruvvyas90/RIOT,rajma996/RIOT,hamilton-mote/RIOT-OS,binarylemon/RIOT,Hyungsin/RIOT-OS,rfuentess/RIOT,jfischer-phytec-iot/RIOT,biboc/RIOT,l3nko/RIOT,x3ro/RIOT,immesys/RiSyn,dkm/RIOT,plushvoxel/RIOT,kerneltask/RIOT,neiljay/RIOT,katezilla/RIOT,rfuentess/RIOT,kbumsik/RIOT,mtausig/RIOT,biboc/RIOT,OTAkeys/RIOT,LudwigOrtmann/RIOT,gebart/RIOT,basilfx/RIOT,toonst/RIOT,LudwigKnuepfer/RIOT,tfar/RIOT,OTAkeys/RIOT,hamilton-mote/RIOT-OS,altairpearl/RIOT,khhhh/RIOT,adjih/RIOT,Josar/RIOT,LudwigKnuepfer/RIOT,adrianghc/RIOT,TobiasFredersdorf/RIOT,authmillenon/RIOT,avmelnikoff/RIOT,rfuentess/RIOT,mziegert/RIOT,wentaoshang/RIOT,kaleb-himes/RIOT,adjih/RIOT,lebrush/RIOT,kerneltask/RIOT,binarylemon/RIOT,msolters/RIOT,ant9000/RIOT,zhuoshuguo/RIOT,kbumsik/RIOT,kbumsik/RIOT,altairpearl/RIOT,alignan/RIOT,binarylemon/RIOT,attdona/RIOT,rakendrathapa/RIOT,kerneltask/RIOT,josephnoir/RIOT,LudwigOrtmann/RIOT,lazytech-org/RIOT,jfischer-phytec-iot/RIOT,smlng/RIOT,khhhh/RIOT,backenklee/RIOT,RIOT-OS/RIOT,kaleb-himes/RIOT,x3ro/RIOT,authmillenon/RIOT,backenklee/RIOT,kb2ma/RIOT,jasonatran/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,gautric/RIOT,RubikonAlpha/RIOT,gebart/RIOT,immesys/RiSyn,LudwigKnuepfer/RIOT,LudwigKnuepfer/RIOT,asanka-code/RIOT,Hyungsin/RIOT-OS,ant9000/RIOT,altairpearl/RIOT,immesys/RiSyn,thomaseichinger/RIOT,FrancescoErmini/RIOT,msolters/RIOT,OlegHahm/RIOT,aeneby/RIOT,mfrey/RIOT,kaspar030/RIOT,l3nko/RIOT,aeneby/RIOT,herrfz/RIOT,plushvoxel/RIOT,aeneby/RIOT,d00616/RIOT,rakendrathapa/RIOT,rajma996/RIOT,OTAkeys/RIOT,x3ro/RIOT,binarylemon/RIOT,herrfz/RIOT,kaspar030/RIOT,katezilla/RIOT,yogo1212/RIOT,jbeyerstedt/RIOT-OTA-update,dhruvvyas90/RIOT,syin2/RIOT,backenklee/RIOT,l3nko/RIOT,kYc0o/RIOT,zhuoshuguo/RIOT,backenklee/RIOT,l3nko/RIOT,LudwigOrtmann/RIOT,tfar/RIOT,ks156/RIOT,TobiasFredersdorf/RIOT,alignan/RIOT,cladmi/RIOT,OlegHahm/RIOT,thomaseichinger/RIOT,malosek/RIOT,syin2/RIOT,lebrush/RIOT,roberthartung/RIOT,jbeyerstedt/RIOT-OTA-update,syin2/RIOT,wentaoshang/RIOT,kYc0o/RIOT,plushvoxel/RIOT,beurdouche/RIOT,attdona/RIOT,jfischer-phytec-iot/RIOT,katezilla/RIOT,herrfz/RIOT,jfischer-phytec-iot/RIOT,gebart/RIOT,msolters/RIOT,Yonezawa-T2/RIOT,basilfx/RIOT,josephnoir/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,ks156/RIOT,kb2ma/RIOT,basilfx/RIOT,cladmi/RIOT,zhuoshuguo/RIOT,jremmert-phytec-iot/RIOT,msolters/RIOT,beurdouche/RIOT,shady33/RIOT,miri64/RIOT,malosek/RIOT,asanka-code/RIOT,FrancescoErmini/RIOT,jremmert-phytec-iot/RIOT,gautric/RIOT,MohmadAyman/RIOT,basilfx/RIOT,kb2ma/RIOT,neumodisch/RIOT,dailab/RIOT,MohmadAyman/RIOT,mziegert/RIOT,jasonatran/RIOT,cladmi/RIOT,lazytech-org/RIOT,yogo1212/RIOT,OlegHahm/RIOT,beurdouche/RIOT,BytesGalore/RIOT,adrianghc/RIOT,malosek/RIOT,beurdouche/RIOT,kb2ma/RIOT,RubikonAlpha/RIOT,msolters/RIOT,kaleb-himes/RIOT,cladmi/RIOT,dhruvvyas90/RIOT,brettswann/RIOT,zhuoshuguo/RIOT,khhhh/RIOT,wentaoshang/RIOT,dhruvvyas90/RIOT,rakendrathapa/RIOT,Josar/RIOT,neumodisch/RIOT,LudwigOrtmann/RIOT,RBartz/RIOT,mfrey/RIOT,josephnoir/RIOT,beurdouche/RIOT,brettswann/RIOT,kaleb-himes/RIOT,plushvoxel/RIOT,jfischer-phytec-iot/RIOT,thomaseichinger/RIOT,jremmert-phytec-iot/RIOT,mziegert/RIOT,kbumsik/RIOT,msolters/RIOT,MohmadAyman/RIOT,RBartz/RIOT,mziegert/RIOT,FrancescoErmini/RIOT,immesys/RiSyn,zhuoshuguo/RIOT,herrfz/RIOT,neiljay/RIOT,miri64/RIOT,miri64/RIOT,smlng/RIOT,authmillenon/RIOT,Josar/RIOT,yogo1212/RIOT,lazytech-org/RIOT,tfar/RIOT,neumodisch/RIOT,TobiasFredersdorf/RIOT,rakendrathapa/RIOT,LudwigOrtmann/RIOT,RubikonAlpha/RIOT,RIOT-OS/RIOT,rfuentess/RIOT