staging: rtl8192e: Remove unused variables num_proc.., recei.. and rxov..

staging: rtl8192e: Remove unused variables num_proc.., recei.. and rxov..

num_process_phyinfo, received_bwtype and rxoverflow are initialized and
increased but never read. Remove dead code. As a result prxsc is unused
which in result makes rxsc_sgien_exflg unused. Remove prxsc and
rxsc_sgien_exflg as well.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/ff9daec237b795a01629080d0d5f7ec73b2d89da.1674675808.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>