Fix remove_volume return value

Signed-off-by: Sumit Sahrawat <sumit.sahrawat.apm13@iitbhu.ac.in>

docker/api/volume.py

@@ -33,4 +33,3 @@ class VolumeApiMixin(object):
         url = self._url('/volumes/{0}', name)
         resp = self._delete(url)
         self._raise_for_status(resp)
-        return True

docs/api.md

@@ -780,8 +780,7 @@ Remove a volume. Similar to the `docker volume rm` command.
 
 * name (str): The volume's name
 
-**Returns** (bool): True on successful removal. Failure will raise a
-`docker.errors.APIError` exception.
+Failure to remove will raise a `docker.errors.APIError` exception.
 
 ## rename
 

tests/integration/volume_test.py

@@ -47,8 +47,7 @@ class TestVolumes(helpers.BaseTestCase):
         name = 'shootthebullet'
         self.tmp_volumes.append(name)
         self.client.create_volume(name)
-        result = self.client.remove_volume(name)
-        self.assertTrue(result)
+        self.client.remove_volume(name)
 
     def test_remove_nonexistent_volume(self):
         name = 'shootthebullet'

tests/unit/volume_test.py

@@ -89,8 +89,7 @@ class VolumeTest(DockerClientTest):
     @base.requires_api_version('1.21')
     def test_remove_volume(self):
         name = 'perfectcherryblossom'
-        result = self.client.remove_volume(name)
-        self.assertTrue(result)
+        self.client.remove_volume(name)
         args = fake_request.call_args
 
         self.assertEqual(args[0][0], 'DELETE')