staging: rtl8192e: Remove unused variables numpacket.. and received_pre..

staging: rtl8192e: Remove unused variables numpacket.. and received_pre..

numpacket_toself, numpacket_matchbssid and received_preamble_GI are
initialized and increased but never read. Remove dead code. As a result
the local variable preamble_guardinterval is unused. Remove it also.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/0ed5f4134176393110fdb0b7424df7a8a6fc6262.1674675808.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>