tests/evtimer_msg: fix F841 local variable 'stop' is assigned to but never used
tests/evtimer_msg: fix F841 local variable 'stop' is assigned to but never used

jasonatran/RIOT,basilfx/RIOT,ant9000/RIOT,cladmi/RIOT,mfrey/RIOT,BytesGalore/RIOT,OTAkeys/RIOT,gebart/RIOT,smlng/RIOT,RIOT-OS/RIOT,cladmi/RIOT,miri64/RIOT,immesys/RiSyn,RIOT-OS/RIOT,toonst/RIOT,smlng/RIOT,A-Paul/RIOT,LudwigOrtmann/RIOT,neiljay/RIOT,x3ro/RIOT,mtausig/RIOT,authmillenon/RIOT,LudwigOrtmann/RIOT,OlegHahm/RIOT,lazytech-org/RIOT,LudwigOrtmann/RIOT,RIOT-OS/RIOT,LudwigKnuepfer/RIOT,ant9000/RIOT,josephnoir/RIOT,kaspar030/RIOT,kbumsik/RIOT,cladmi/RIOT,ant9000/RIOT,OlegHahm/RIOT,gebart/RIOT,kbumsik/RIOT,rfuentess/RIOT,josephnoir/RIOT,kYc0o/RIOT,authmillenon/RIOT,mfrey/RIOT,yogo1212/RIOT,basilfx/RIOT,Josar/RIOT,miri64/RIOT,authmillenon/RIOT,LudwigKnuepfer/RIOT,Josar/RIOT,biboc/RIOT,roberthartung/RIOT,immesys/RiSyn,josephnoir/RIOT,smlng/RIOT,josephnoir/RIOT,cladmi/RIOT,miri64/RIOT,rfuentess/RIOT,BytesGalore/RIOT,neiljay/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,Josar/RIOT,biboc/RIOT,mtausig/RIOT,biboc/RIOT,roberthartung/RIOT,immesys/RiSyn,OlegHahm/RIOT,yogo1212/RIOT,jasonatran/RIOT,basilfx/RIOT,LudwigKnuepfer/RIOT,kaspar030/RIOT,yogo1212/RIOT,cladmi/RIOT,smlng/RIOT,x3ro/RIOT,OTAkeys/RIOT,avmelnikoff/RIOT,toonst/RIOT,OTAkeys/RIOT,LudwigOrtmann/RIOT,kYc0o/RIOT,neiljay/RIOT,aeneby/RIOT,A-Paul/RIOT,gebart/RIOT,biboc/RIOT,OlegHahm/RIOT,toonst/RIOT,kbumsik/RIOT,gebart/RIOT,basilfx/RIOT,roberthartung/RIOT,rfuentess/RIOT,yogo1212/RIOT,authmillenon/RIOT,lazytech-org/RIOT,Josar/RIOT,x3ro/RIOT,OlegHahm/RIOT,avmelnikoff/RIOT,jasonatran/RIOT,yogo1212/RIOT,BytesGalore/RIOT,neiljay/RIOT,toonst/RIOT,gebart/RIOT,immesys/RiSyn,lazytech-org/RIOT,A-Paul/RIOT,OTAkeys/RIOT,ant9000/RIOT,miri64/RIOT,kaspar030/RIOT,kbumsik/RIOT,lazytech-org/RIOT,kYc0o/RIOT,Josar/RIOT,basilfx/RIOT,roberthartung/RIOT,avmelnikoff/RIOT,biboc/RIOT,neiljay/RIOT,authmillenon/RIOT,josephnoir/RIOT,mtausig/RIOT,OTAkeys/RIOT,aeneby/RIOT,A-Paul/RIOT,mfrey/RIOT,authmillenon/RIOT,mtausig/RIOT,x3ro/RIOT,rfuentess/RIOT,BytesGalore/RIOT,rfuentess/RIOT,jasonatran/RIOT,smlng/RIOT,ant9000/RIOT,kYc0o/RIOT,kbumsik/RIOT,yogo1212/RIOT,roberthartung/RIOT,x3ro/RIOT,toonst/RIOT,mfrey/RIOT,LudwigKnuepfer/RIOT,RIOT-OS/RIOT,LudwigKnuepfer/RIOT,mtausig/RIOT,aeneby/RIOT,LudwigOrtmann/RIOT,miri64/RIOT,immesys/RiSyn,lazytech-org/RIOT,avmelnikoff/RIOT,mfrey/RIOT,immesys/RiSyn,aeneby/RIOT,BytesGalore/RIOT,A-Paul/RIOT,aeneby/RIOT,avmelnikoff/RIOT,kaspar030/RIOT,kYc0o/RIOT,LudwigOrtmann/RIOT