spicy: Add call of gst_deinit at program exit

This is useful for some instrumentation, e.g. the leaks tracer,
that perform some of their operations within gst_deinit.

Without this patch, if you run spicy with
	GST_DEBUG="GST_TRACER:7" GST_TRACERS="leaks" spicy ...
the leak tracer does not show any output, because it runs in gst_deinit.

Signed-off-by: Christophe de Dinechin <dinechin@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>

tools/spicy.c

@@ -2068,5 +2068,8 @@ int main(int argc, char *argv[])
     g_free(spicy_title);
 
     setup_terminal(true);
+#if HAVE_GSTAUDIO || HAVE_GSTVIDEO
+    gst_deinit();
+#endif
     return 0;
 }