Use temporary variable

Use temporary variable

-  Use the temporary variable more, as it helps readability: it removes
   a derefecence, which itself allows removing some parentheses.

-  Use a shorter name, which is more common with temporaries, and so
   there's less to read.

-  Assign to *ranges at the end of the function.  It's the same, but
   with the other changes, I think this makes it slightly clearer.

Signed-off-by: Alejandro Colomar <alx@kernel.org>