Probably invalid assertion

(cherry picked from commit 006d280285b591a8dfec67a8ec31a94263c0c683)

Source commit: 993fbb3b9a95cf2cab08bd10cce9ee5b30a911f8

source/filezilla/FtpControlSocket.cpp

@@ -4680,8 +4680,6 @@ void CFtpControlSocket::ResetOperation(int nSuccessful /*=FALSE*/)
     m_pOwner->SetBusy(FALSE);
     //No operation in progress
     nSuccessful&=FZ_REPLY_DISCONNECTED|FZ_REPLY_CANCEL;
-    if (!nSuccessful)
-      DebugFail();
   }
 
   if (nSuccessful&FZ_REPLY_DISCONNECTED)