[calls] tests: call: Prefer G_SOURCE_REMOVE instead of FALSE

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 6c857ba94acca2697c6fff2bd13266b196a79e33
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Thu Jan 27 15:40:23 2022 +0100

    tests: call: Prefer G_SOURCE_REMOVE instead of FALSE

 tests/test-call.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tests/test-call.c b/tests/test-call.c
index 1b0698be..7db26456 100644
--- a/tests/test-call.c
+++ b/tests/test-call.c
@@ -47,7 +47,7 @@ static gboolean
 test_dummy_call_hang_up_idle_cb (CallsDummyOrigin *origin)
 {
   g_assert_null (calls_origin_get_calls (CALLS_ORIGIN (origin)));
-  return FALSE;
+  return G_SOURCE_REMOVE;
 }
 
 static void