Microsoft does not have released a patch for OneDrive for Business on Patch day in march.But with all patches in April there is also an Patch for the sync client with KB 2956185.
But you should only install the patch, if you have installed Office 2013 as a msi-Installation. I have describe that here.
the Patch fix following issue:
When you use OneDrive for Business to synchronize a document library that contains deep folder structures, you may experience an unrepairable issue.
You will find the Groove.exe on you windows client: “X:\Program Files\Microsoft Office\Office 15”
|Groove.exe (Februar Patch)||Groove.exe (April-Patch)|
This update contains the files that are listed in the following tables.
There are only 15 steps between the “old” and the “new” version, which of course suggesting that Microsoft fully concentrates on the new client (NGSC).