disks: Properly initialize read/write counters
These are used to calculate the read/write rate. If they are left uninitialised, the first update of those rates will be a bogus value. BUG: 448494
These are used to calculate the read/write rate. If they are left uninitialised, the first update of those rates will be a bogus value. BUG: 448494
mentioned in commit 9a301fc6