test 1449: [nfc] do not capture stdout

Graphviz is being passed `-o /dev/null` in this test case, so there is no need
to capture stdout.

diff --git a/rtest/test_regression.py b/rtest/test_regression.py
index 267d52f455917c8ab2e83674f11fcc811c80d764..a9e84c646596433d6ae88f2109bc9f78b128f4e3 100644 (file)
--- a/rtest/test_regression.py
+++ b/rtest/test_regression.py
@@ -487,7 +487,7 @@ def test_1449():
 
   # start Graphviz
   with subprocess.Popen(["dot", "-Tsvg", "-o", os.devnull],
-                        stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                        stdin=subprocess.PIPE,
                         stderr=subprocess.PIPE, universal_newlines=True) as p:
 
     # pass it some input that uses the SVG color scheme