/**\r
Clean up signer's certificates for common authenticated variable\r
by corresponding VariableName and VendorGuid from "certdb".\r
- Sytem may break down during Timebased Variable update & certdb update,\r
+ System may break down during Timebased Variable update & certdb update,\r
make them inconsistent, this function is called in AuthVariable Init to ensure\r
consistency\r
\r