Fix a crasher in openMDB because we were returning a wrong error code. R=chuang

mailnews/addrbook/src/nsAddrDatabase.cpp

@@ -708,6 +708,9 @@ NS_IMETHODIMP nsAddrDatabase::OpenMDB(nsFileSpec *dbName, PRBool create)
 			}
 		}
 	}
+	//Convert the DB error to a valid nsresult error.
+	if (ret == 1)
+	  ret = NS_ERROR_FAILURE;
 	return ret;
 }