tree: pep8 + linter fixes

For some reasons I forgot to fix those in the previous runs. Fix a
linter and pep8 warning.

Signed-off-by: David Rheinsberg <david.rheinsberg@gmail.com>

test/mod/test_fmt_v2.py

@@ -344,7 +344,7 @@ class TestFormatV2(unittest.TestCase):
 
     def test_device_sorting(self):
         fmt = self.index.get_format_info("osbuild.formats.v2").module
-        assert(fmt)
+        assert fmt
 
         self_cycle = {
             "a": {"parent": "a"},

tools/osbuild-mpp

@@ -573,7 +573,8 @@ LocalFileSigLevel = Optional
             cfgfile.write(f"[{rid}]\n")
             cfgfile.write(f"Server = {url}\n")
 
-    def _pacman(self, *args):
+    @staticmethod
+    def _pacman(*args):
         return subprocess.check_output(["pacman", *args], encoding="utf-8")
 
     def resolve(self, packages, _):
@@ -1228,6 +1229,7 @@ class ManifestFile:
         name = desc.get("id", "image")
         self.vars[name] = Image.from_dict(desc)
 
+    # pylint: disable=no-self-use
     def get_pipeline_name(self, node):
         return node.get("name", "")
 

tools/tree-diff

@@ -81,6 +81,7 @@ def symlink_diff(name, dir_fd1, dir_fd2, path, differences):
         props["symlink"] = [os.fsdecode(target1), os.fsdecode(target2)]
 
 
+# pylint: disable=too-many-branches
 def diff_aux(dir_fd1, dir_fd2, path, report):
     entries1 = set()
     with os.scandir(dir_fd1) as it: