staging: rtl8192u: ieee80211: remove set but not used variable 'data_len'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c:
 In function ieee80211_ccmp_encrypt:
drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c:162:6:
 warning: variable data_len set but not used [-Wunused-but-set-variable]

It is not used since commit eb0e7bf3ca94 ("staging:
rtl8192u: ieee80211: ieee80211_crypt_ccmp.c: Use crypto API ccm(aes)")

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190821122250.71404-1-yuehaibing@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
index aecee42be95ecd16c7e74ad154bf93aeb5dbc401..a43a5d617bd9ff7a204bda5cb86a2fe4fe142370 100644 (file)
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
@@ -159,7 +159,7 @@ static int ccmp_init_iv_and_aad(struct rtl_80211_hdr_4addr *hdr,
 static int ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
 {
        struct ieee80211_ccmp_data *key = priv;
-       int data_len, i;
+       int i;
        u8 *pos;
        struct rtl_80211_hdr_4addr *hdr;
        struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
@@ -169,7 +169,6 @@ static int ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
            skb->len < hdr_len)
                return -1;
 
-       data_len = skb->len - hdr_len;
        pos = skb_push(skb, CCMP_HDR_LEN);
        memmove(pos, pos + CCMP_HDR_LEN, hdr_len);
        pos += hdr_len;