staging: rtl8192e: Rename variable currentRATR

Rename variable currentRATR to current_ratr to avoid CamelCase
which is not accepted by checkpatch.

Signed-off-by: Yogesh Hegde <yogi.kernel@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/091a5abb231fb5c88d47f329ec3b5133b08d6b23.1688299890.git.yogi.kernel@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>