[PATCH] tests/qapi-schema: Tidy up pylint warnings and advice

[Markus Armbruster <armbru@redhat.com>]

Pylint warns:

    tests/qapi-schema/test-qapi.py:139:13: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)
    tests/qapi-schema/test-qapi.py:143:13: W1514: Using open without explicitly specifying an encoding (unspecified-encoding)

Add encoding='utf-8'.

Pylint advises:

    tests/qapi-schema/test-qapi.py:143:13: R1732: Consider using 'with' for resource-allocating operations (consider-using-with)

Silence this by returning the value directly.

Pylint advises:

    tests/qapi-schema/test-qapi.py:221:4: R1722: Consider using sys.exit() (consider-using-sys-exit)
    tests/qapi-schema/test-qapi.py:226:4: R1722: Consider using sys.exit() (consider-using-sys-exit)

Sure, why not.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 tests/qapi-schema/test-qapi.py | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tests/qapi-schema/test-qapi.py b/tests/qapi-schema/test-qapi.py
index d58c31f539..14f7b62a44 100755
--- a/tests/qapi-schema/test-qapi.py
+++ b/tests/qapi-schema/test-qapi.py
@@ -136,12 +136,11 @@ def test_frontend(fname):
 def open_test_result(dir_name, file_name, update):
     mode = 'r+' if update else 'r'
     try:
-        fp = open(os.path.join(dir_name, file_name), mode)
+        return open(os.path.join(dir_name, file_name), mode, encoding='utf-8')
     except FileNotFoundError:
         if not update:
             raise
-        fp = open(os.path.join(dir_name, file_name), 'w+')
-    return fp
+    return open(os.path.join(dir_name, file_name), 'w+', encoding='utf-8')
 
 
 def test_and_diff(test_name, dir_name, update):
@@ -218,9 +217,9 @@ def main(argv):
         test_name = os.path.splitext(base_name)[0]
         status |= test_and_diff(test_name, dir_name, args.update)
 
-    exit(status)
+    sys.exit(status)
 
 
 if __name__ == '__main__':
     main(sys.argv)
-    exit(0)
+    sys.exit(0)
-- 
2.41.0