PVS-Studio warning V614 for NetXMS

int OdbcDisconnect(void* pvSqlCtx)
{
  ....
  SQLRETURN nSqlRet;
  ....
  if (nRet == SUCCESS)
  {
    ....
    nSqlRet = SQLDisconnect(pSqlCtx->hDbc);
    ....
  }
  if (SQLRET_FAIL(nSqlRet))
  ....
}

This suspicious code was found in NetXMS project by PVS-Studio static code analyzer.
Warning message is:
V614 Potentially uninitialized variable 'nSqlRet' used. odbcsapi.cpp 220

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/