wifi: iwlegacy: remove redundant variable len

Variable len is being assigned and modified but it is never
used. The variable is redundant and can be removed.

Cleans up clang scan build warning:
warning: variable 'len' set but not used [-Wunused-but-set-variable]

Signed-off-by: Colin Ian King <[e-mail]>
Acked-by: Stanislaw Gruszka <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/net/wireless/intel/iwlegacy/3945-mac.c

···
 		D_RX("r = %d, i = %d\n", r, i);
 
 	while (i != r) {
-		int len;
-
 		rxb = rxq->queue[i];
 
 		/* If an RXB doesn't have a Rx queue slot associated with it,
···
 			       PAGE_SIZE << il->hw_params.rx_page_order,
 			       DMA_FROM_DEVICE);
 		pkt = rxb_addr(rxb);
-
-		len = le32_to_cpu(pkt->len_n_flags) & IL_RX_FRAME_SIZE_MSK;
-		len += sizeof(u32);	/* account for status word */
-
 		reclaim = il_need_reclaim(il, pkt);
 
 		/* Based on type of command response or notification,