Fixed access violations when clicking OK on the "Filter IP" dialog box after

client has disconnected.

src/sbbs3/ctrl/ClientFormUnit.cpp

@@ -115,18 +115,20 @@ void __fastcall TClientForm::FilterIpMenuItemClick(TObject *Sender)
 
     while(ListItem!=NULL) {
 
+   	    AnsiString prot 	= ListItem->SubItems->Strings[0];
+	    AnsiString username = ListItem->SubItems->Strings[1];
+    	AnsiString ip_addr 	= ListItem->SubItems->Strings[2];
+
     	wsprintf(str,"Disallow future connections from %s"
-        	,ListItem->SubItems->Strings[2].c_str());
+        	,ip_addr);
     	res=Application->MessageBox(str,"Filter IP?"
         		,MB_YESNOCANCEL|MB_ICONQUESTION);
         if(res==IDCANCEL)
     		break;
     	if(res==IDYES)
-	        MainForm->FilterIP(
-    	     	 ListItem->SubItems->Strings[2].c_str() /* ip_addr */
-	        	,ListItem->SubItems->Strings[0].c_str() /* protocol */
-	        	,ListItem->SubItems->Strings[1].c_str() /* username */
-	            );
+	        MainForm->FilterIP(ip_addr.c_str(),prot.c_str(),username.c_str());
+        if(ListView->Selected == NULL)
+        	break;
         ListItem=ListView->GetNextItem(ListItem,sdAll,State);
     }
 }