sharead/mainloop-glib: Fix mainloop_exit*

These function shall cause the mainloop to quit.
diff --git a/src/shared/mainloop-glib.c b/src/shared/mainloop-glib.c
index 14d4320..1bbac5d 100644
--- a/src/shared/mainloop-glib.c
+++ b/src/shared/mainloop-glib.c
@@ -53,11 +53,13 @@
 void mainloop_exit_success(void)
 {
 	exit_status = EXIT_SUCCESS;
+	mainloop_quit();
 }
 
 void mainloop_exit_failure(void)
 {
 	exit_status = EXIT_FAILURE;
+	mainloop_quit();
 }
 
 int mainloop_run(void)