lint: fix inconsistent-return-statements

Author: oikarinen

pghoard/gnutaremu.py

@@ -33,6 +33,7 @@ def makedirs(cls, path):
             return os.makedirs(path, 0o777)
         except FileExistsError:
             pass
+        return None
 
     def run(self):
         return self._extract(self._open_input_file())

pghoard/rohmu/compat.py

@@ -56,3 +56,4 @@ def makedirs(path, mode=0o777, exist_ok=False):
             return os.makedirs(path, mode)
         except FileExistsError:
             pass
+        return None