Add titlebar encryption text to plugins api

src/ui/window.c

@@ -146,6 +146,7 @@ win_create_chat(const char *const barejid)
     new_win->history_shown = FALSE;
     new_win->unread = 0;
     new_win->state = chat_state_new();
+    new_win->enctext = NULL;
 
     new_win->memcheck = PROFCHATWIN_MEMCHECK;
 
@@ -430,6 +431,7 @@ win_free(ProfWin* window)
         ProfChatWin *chatwin = (ProfChatWin*)window;
         free(chatwin->barejid);
         free(chatwin->resource_override);
+        free(chatwin->enctext);
         chat_state_free(chatwin->state);
         break;
     }