tests: [nfc] use newer 'dot' helper in #1902

diff --git a/rtest/test_regression.py b/rtest/test_regression.py
index 39eeea5f8d08c768ce80ec2124849e3dd97c23d7..18d1fa8315582959b2da4f5c75de5a352e825a9b 100644 (file)
--- a/rtest/test_regression.py
+++ b/rtest/test_regression.py
@@ -804,7 +804,7 @@ def test_1902():
 
   # ask Graphviz to process it, which should generate a segfault if this bug
   # has been reintroduced
-  subprocess.check_call(['dot', '-Tsvg', '-o', os.devnull, input])
+  dot('svg', input)
 
 # root directory of this checkout
 ROOT = Path(__file__).parent.parent.resolve()