Avoid aliasing variables if we aren't going to use them.

diffoscope/comparators/directory.py

@@ -160,7 +160,7 @@ def compare_meta(path1, path2):
     try:
         stat1 = os.lstat(path1)
         stat2 = os.lstat(path2)
-    except Exception as e:
+    except Exception:
         return []
 
     differences = []

diffoscope/comparators/fit.py

@@ -81,7 +81,7 @@ class FitContainer(Archive):
             dest_path,
         )
 
-        output = command.our_check_output(cmd)
+        command.our_check_output(cmd)
 
         # Cannot rely on dumpimage returning a non-zero exit code on failure.
         if not os.path.exists(dest_path):