Update test_benchmarks.py

Author: sdpython

tests/test_benchmarks.py

@@ -21,7 +21,7 @@ def test_profile_conversion_time(self):
         proc = subprocess.Popen(
             ["python", filename], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         try:
-            outs, errs = proc.communicate(timeout=15)
+            outs = proc.communicate(timeout=15)[0]
         except subprocess.TimeoutExpired:
             proc.kill()
             return