Fix sigsev in setNickOffline

Thanks to Vilém Maršík for the original patch
This resolves Bug 2840

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 3a934bd343)

konversation/src/server.cpp

@@ -2326,9 +2326,8 @@ bool Server::setNickOffline(const TQString& nickname)
 {
     TQString lcNickname = nickname.lower();
     NickInfoPtr nickInfo = getNickInfo(lcNickname);
-    bool wasOnline = nickInfo->getPrintedOnline();
 
-    if (nickInfo && wasOnline)
+    if (nickInfo && nickInfo->getPrintedOnline())
     {
         // Delete from query list, if present.
         if (m_queryNicks.contains(lcNickname)) m_queryNicks.remove(lcNickname);