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

Since the commit 5f1a6826 ("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.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtllib_crypt_tkip.c

@@ -637,9 +637,6 @@ static int rtllib_tkip_get_key(void *key, int len, u8 *seq, void *priv)
 
 	if (seq) {
 		/* Return the sequence number of the last transmitted frame. */
-		u16 iv16 = tkey->tx_iv16;
-
-		iv16--;
 		seq[0] = tkey->tx_iv16;
 		seq[1] = tkey->tx_iv16 >> 8;
 		seq[2] = tkey->tx_iv32;