sc_vfs: fix _ls_handler
sc_vfs: fix _ls_handler

Calls to vfs_closedir were missing at the end of _ls_handler causing umount
ro return an error.

miri64/RIOT,jasonatran/RIOT,A-Paul/RIOT,neiljay/RIOT,kaspar030/RIOT,neiljay/RIOT,immesys/RiSyn,roberthartung/RIOT,dailab/RIOT,jasonatran/RIOT,Ell-i/RIOT,A-Paul/RIOT,gebart/RIOT,dkm/RIOT,Ell-i/RIOT,x3ro/RIOT,jasonatran/RIOT,Hyungsin/RIOT-OS,Ell-i/RIOT,basilfx/RIOT,adrianghc/RIOT,neumodisch/RIOT,LudwigKnuepfer/RIOT,x3ro/RIOT,A-Paul/RIOT,thomaseichinger/RIOT,Hyungsin/RIOT-OS,gebart/RIOT,kYc0o/RIOT,neiljay/RIOT,kaspar030/RIOT,jasonatran/RIOT,adrianghc/RIOT,kerneltask/RIOT,Ell-i/RIOT,basilfx/RIOT,kaleb-himes/RIOT,kaspar030/RIOT,kbumsik/RIOT,A-Paul/RIOT,OlegHahm/RIOT,toonst/RIOT,kbumsik/RIOT,beurdouche/RIOT,aeneby/RIOT,josephnoir/RIOT,mtausig/RIOT,thomaseichinger/RIOT,josephnoir/RIOT,LudwigOrtmann/RIOT,dailab/RIOT,Josar/RIOT,hamilton-mote/RIOT-OS,adjih/RIOT,toonst/RIOT,plushvoxel/RIOT,ant9000/RIOT,thomaseichinger/RIOT,ant9000/RIOT,ks156/RIOT,toonst/RIOT,avmelnikoff/RIOT,thomaseichinger/RIOT,roberthartung/RIOT,OTAkeys/RIOT,toonst/RIOT,RIOT-OS/RIOT,jfischer-phytec-iot/RIOT,mtausig/RIOT,thomaseichinger/RIOT,dkm/RIOT,adjih/RIOT,authmillenon/RIOT,Josar/RIOT,ks156/RIOT,basilfx/RIOT,ant9000/RIOT,neumodisch/RIOT,dkm/RIOT,aeneby/RIOT,kerneltask/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,beurdouche/RIOT,plushvoxel/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,LudwigKnuepfer/RIOT,OTAkeys/RIOT,miri64/RIOT,roberthartung/RIOT,A-Paul/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,hamilton-mote/RIOT-OS,RIOT-OS/RIOT,kaleb-himes/RIOT,miri64/RIOT,kbumsik/RIOT,avmelnikoff/RIOT,Josar/RIOT,mfrey/RIOT,yogo1212/RIOT,mtausig/RIOT,adrianghc/RIOT,LudwigOrtmann/RIOT,rfuentess/RIOT,mfrey/RIOT,OlegHahm/RIOT,miri64/RIOT,basilfx/RIOT,dailab/RIOT,rfuentess/RIOT,authmillenon/RIOT,biboc/RIOT,roberthartung/RIOT,jfischer-phytec-iot/RIOT,yogo1212/RIOT,authmillenon/RIOT,biboc/RIOT,smlng/RIOT,biboc/RIOT,roberthartung/RIOT,immesys/RiSyn,neumodisch/RIOT,kaleb-himes/RIOT,aeneby/RIOT,jfischer-phytec-iot/RIOT,immesys/RiSyn,yogo1212/RIOT,ant9000/RIOT,lazytech-org/RIOT,authmillenon/RIOT,yogo1212/RIOT,rfuentess/RIOT,plushvoxel/RIOT,BytesGalore/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,basilfx/RIOT,kYc0o/RIOT,yogo1212/RIOT,cladmi/RIOT,lazytech-org/RIOT,hamilton-mote/RIOT-OS,plushvoxel/RIOT,LudwigOrtmann/RIOT,neiljay/RIOT,cladmi/RIOT,smlng/RIOT,biboc/RIOT,ant9000/RIOT,mfrey/RIOT,kbumsik/RIOT,Josar/RIOT,adrianghc/RIOT,adjih/RIOT,dkm/RIOT,smlng/RIOT,x3ro/RIOT,mtausig/RIOT,jfischer-phytec-iot/RIOT,LudwigOrtmann/RIOT,kYc0o/RIOT,kYc0o/RIOT,neumodisch/RIOT,cladmi/RIOT,kbumsik/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,mfrey/RIOT,kaspar030/RIOT,lazytech-org/RIOT,adjih/RIOT,smlng/RIOT,smlng/RIOT,LudwigOrtmann/RIOT,Ell-i/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,immesys/RiSyn,dailab/RIOT,rfuentess/RIOT,josephnoir/RIOT,kaleb-himes/RIOT,dailab/RIOT,ks156/RIOT,LudwigKnuepfer/RIOT,BytesGalore/RIOT,neiljay/RIOT,aeneby/RIOT,LudwigKnuepfer/RIOT,kaspar030/RIOT,lazytech-org/RIOT,authmillenon/RIOT,authmillenon/RIOT,OTAkeys/RIOT,immesys/RiSyn,RIOT-OS/RIOT,x3ro/RIOT,x3ro/RIOT,immesys/RiSyn,OlegHahm/RIOT,kaleb-himes/RIOT,RIOT-OS/RIOT,Hyungsin/RIOT-OS,avmelnikoff/RIOT,miri64/RIOT,BytesGalore/RIOT,jfischer-phytec-iot/RIOT,Josar/RIOT,BytesGalore/RIOT,gebart/RIOT,LudwigOrtmann/RIOT,beurdouche/RIOT,adjih/RIOT,OlegHahm/RIOT,yogo1212/RIOT,OlegHahm/RIOT,hamilton-mote/RIOT-OS,ks156/RIOT,cladmi/RIOT,hamilton-mote/RIOT-OS,avmelnikoff/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,aeneby/RIOT,Hyungsin/RIOT-OS,BytesGalore/RIOT,gebart/RIOT,ks156/RIOT,adrianghc/RIOT,lazytech-org/RIOT,kYc0o/RIOT,neumodisch/RIOT,beurdouche/RIOT,gebart/RIOT,neumodisch/RIOT,kerneltask/RIOT,Hyungsin/RIOT-OS,cladmi/RIOT,avmelnikoff/RIOT,biboc/RIOT,rfuentess/RIOT,LudwigKnuepfer/RIOT,dkm/RIOT,beurdouche/RIOT,plushvoxel/RIOT,josephnoir/RIOT,mfrey/RIOT,kerneltask/RIOT,toonst/RIOT,josephnoir/RIOT,kerneltask/RIOT,mtausig/RIOT