[pyatspi2] tests: Fix another compiler warning

[Mike Gorse <mgorse src gnome org>]

commit d0fbc0f88aa47b6899ddbd326af9ceac96b04414
Author: Mike Gorse <mgorse suse com>
Date:   Mon Oct 3 13:42:39 2022 -0500

    tests: Fix another compiler warning

 tests/apps/test-application.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tests/apps/test-application.c b/tests/apps/test-application.c
index 8d0b5954..1ae1eeef 100644
--- a/tests/apps/test-application.c
+++ b/tests/apps/test-application.c
@@ -259,6 +259,7 @@ static GOptionEntry optentries[] =
  * 
  * Entry point for all test applications.
  */
+int
 main(int argc, char *argv[])
 {
   GOptionContext *opt;