support/testing: test_jq.py: use assertRunNotOk()

Use the helper to simplify the test.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/testing/tests/package/test_jq.py

@@ -34,8 +34,7 @@ class TestJq(infra.basetest.BRTest):
 
         # Check the execution fails on a non JSON file.
         cmd = "jq -M '.' broken.json"
-        _, ret = self.emulator.run(cmd)
-        self.assertNotEqual(ret, 0)
+        self.assertRunNotOk(cmd)
 
         # Check an execution of a simple query. Note that output is a
         # JSON (quoted) string.