Revert "diskusage: Use mkdir -p to create dirs."
Revert "diskusage: Use mkdir -p to create dirs."

This reverts commit accac9d1264ecb2cf826239c854bf96375050623. I don't
see what the -p can possibly achieve.

matlink/fdroidserver,f-droid/fdroid-server,matlink/fdroidserver,pfalcon/fdroidserver,OneEducation/AppUniverse_Server,matlink/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,OneEducation/AppUniverse_Server,matlink/fdroidserver,f-droid/fdroidserver,matlink/fdroidserver,pfalcon/fdroidserver,fdroidtravis/fdroidserver,fantastico/fdroidserver,pfalcon/fdroidserver,OneEducation/AppUniverse_Server,fantastico/fdroidserver,fdroidtravis/fdroidserver,pfalcon/fdroidserver,f-droid/fdroid-server,fantastico/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,fantastico/fdroidserver,f-droid/fdroidserver,pfalcon/fdroidserver,fantastico/fdroidserver,f-droid/fdroidserver,OneEducation/AppUniverse_Server,OneEducation/AppUniverse_Server,f-droid/fdroidserver,f-droid/fdroid-server