Fix a bunch of obvious memory leaks at termination

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

src/ui/inputwin.c

@@ -273,6 +273,7 @@ void
 inp_close(void)
 {
     rl_callback_handler_remove();
+    delwin(inp_win);
     fclose(discard);
 }