staging: rtl8192e: Rename CurSlotTime

Rename variable CurSlotTime to cur_slot_time to avoid CamelCase which is
not accepted by checkpatch.pl.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/1b71366d87b2b178fcd8f182127a51c7a7507936.1662402870.git.philipp.g.hortmann@gmail.com


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