staging: rtl8192e: remove set but otherwise unused local variable iv16

staging: rtl8192e: remove set but otherwise unused local variable iv16

Since the commit 5f1a6826ea49 ("staging: rtl8192e: remove set but
otherwise unused local variable iv32"), the local variable iv16 is set
but otherwise unused. So remove it.

Compile tested only.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202408232049.UJef268y-lkp@intel.com/
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240823-rtl8192e-iv16-v1-1-000702673065@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>