staging: rtl8192e: Remove unused variables txov.., txbeokint and txbkokint

txoverflow, txbeokint and txbkokint are initialized and increased but
never read. Remove dead code.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/023f612dc35eca3a74c31344f7dbb168180bf437.1674675808.git.philipp.g.hortmann@gmail.com


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