There was a race condition here where the GLib timeout could have
fired but the test function returned successfully prior to the
end of the while loop. This would end up causing source_remove to
print a warning that the source did not exist.

Instead check if the timeout fired prior to removing it.
---
 tools/test-runner | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/test-runner b/tools/test-runner
index 5a8006a5..dcb1ba5e 100755
--- a/tools/test-runner
+++ b/tools/test-runner
@@ -751,10 +751,12 @@ class Namespace:
 			try:
 				ret = func(*args)
 				if ret:
-					GLib.source_remove(timeout)
+					if not done.value:
+						GLib.source_remove(timeout)
 					return ret
 			except Exception as e:
-				GLib.source_remove(timeout)
+				if not done.value:
+					GLib.source_remove(timeout)
 				raise e
 
 			sleep(0.1)
-- 
2.31.1