staging: rtl8192e: Remove entry .tx_check_stuc.. from struct rtl819x_ops

Remove entry .tx_check_stuck_handler and replace it with function name
rtl92e_is_tx_stuck. This increases readability of the code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/f58cc7b39f4a6bce0606bdd90a706b35b87d8256.1677010997.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>