[rhythmbox] fix some more void prototypes

[Jonathan Matthew <jmatthew src gnome org>]

commit c95a7a8be9de238a90d592308e45466235838755
Author: Jonathan Matthew <jonathan d14n org>
Date:   Wed Dec 1 20:38:06 2021 +1000

    fix some more void prototypes
    
    Fixes #1934

 tests/test-audioscrobbler.c | 2 +-
 tests/test-file-helpers.c   | 2 +-
 tests/test-rb-lib.c         | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/tests/test-audioscrobbler.c b/tests/test-audioscrobbler.c
index 839975df9..5fcc42a1e 100644
--- a/tests/test-audioscrobbler.c
+++ b/tests/test-audioscrobbler.c
@@ -74,7 +74,7 @@ START_TEST (test_rb_audioscrobbler_entry)
 END_TEST
 
 static Suite *
-rb_audioscrobbler_suite ()
+rb_audioscrobbler_suite (void)
 {
        Suite *s = suite_create ("rb-audioscrobbler");
        TCase *tc_chain = tcase_create ("rb-audioscrobbler-entry");
diff --git a/tests/test-file-helpers.c b/tests/test-file-helpers.c
index d1f99caa3..7f1cdd949 100644
--- a/tests/test-file-helpers.c
+++ b/tests/test-file-helpers.c
@@ -117,7 +117,7 @@ START_TEST (test_rb_uri_is_descendant)
 END_TEST
 
 static Suite *
-rb_file_helpers_suite ()
+rb_file_helpers_suite (void)
 {
        Suite *s = suite_create ("rb-file-helpers");
        TCase *tc_chain = tcase_create ("rb-file-helpers-core");
diff --git a/tests/test-rb-lib.c b/tests/test-rb-lib.c
index e652fded6..5a2651352 100644
--- a/tests/test-rb-lib.c
+++ b/tests/test-rb-lib.c
@@ -83,7 +83,7 @@ START_TEST (test_rb_string_value_map)
 END_TEST
 
 static Suite *
-rb_file_helpers_suite ()
+rb_file_helpers_suite (void)
 {
        Suite *s = suite_create ("rb-utils");
        TCase *tc_chain = tcase_create ("rb-utils-core");