sys: xtimer: add another safeguard against setting a timer in the past
sys: xtimer: add another safeguard against setting a timer in the past

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