staging: rtl8192e: remove set but otherwise unused local variable iv32

Remove iv32 from rtllib_tkip_get_key() as it is set but otherwise
unused.

Flagged by allmodconfig W=1 builds with gcc-13 and clang-18.
Compile tested only.
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240821-rtl8192e-unused-var-v1-1-08b9e869260e@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtllib_crypt_tkip.c

@@ -638,10 +638,7 @@ 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;
-		u32 iv32 = tkey->tx_iv32;
 
-		if (iv16 == 0)
-			iv32--;
 		iv16--;
 		seq[0] = tkey->tx_iv16;
 		seq[1] = tkey->tx_iv16 >> 8;