staging: rtl8192e: Remove unused variables rxcrcerrmin and friends

rxcrcerrmin, rxcrcerrmax and rxcrcerrmid 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/4c791fbb3559ce15de60b7bdcabbc50b0ee9adb9.1674675808.git.philipp.g.hortmann@gmail.com


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