ipw2x00: remove redundant assignment to err

Variable err is initialized to a value that is never read and it
is re-assigned later.  The initialization is redundant and can
be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/intel/ipw2x00/ipw2100.c

@@ -4413,7 +4413,7 @@ static void ipw2100_kill_works(struct ipw2100_priv *priv)
 
 static int ipw2100_tx_allocate(struct ipw2100_priv *priv)
 {
-	int i, j, err = -EINVAL;
+	int i, j, err;
 	void *v;
 	dma_addr_t p;