lint fix

rwx/cmd/__init__.py

@@ -10,6 +10,5 @@ def need(command: str) -> None:
             package = "squashfs-tools"
         case _:
             package = None
-    if package:
-        if package not in packages:
-            packages.append(package)
+    if package and package not in packages:
+        packages.append(package)

rwx/cmd/squashfs/__init__.py

@@ -1,4 +1,5 @@
 import ps
+
 import rwx.cmd
 
 rwx.cmd.need("mksquashfs")