Change char->free to auto_char char for autocleanup

Replace `gchar` and `g_free` to `auto_gchar`
Correct certain  `char` functions/variables to `gchar`

Related to #1819.

Edited by @jubalh.

src/ui/titlebar.c

@@ -195,13 +195,11 @@ _title_bar_draw(void)
         waddch(win, ' ');
     }
 
-    char* title = win_get_title(current);
+    auto_char char* title = win_get_title(current);
 
     mvwprintw(win, 0, 0, " %s", title);
     pos = strlen(title) + 1;
 
-    free(title);
-
     // presence is written from the right side
     // calculate it first so we have a maxposition
     maxrightpos = _calc_self_presence();