staging: rtlwifi: remove memset before memcpy

calling memcpy immediately after memset with the same region of memory
makes memset redundant.
Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtlwifi/base.c

@@ -2558,7 +2558,6 @@ bool rtl_check_beacon_key(struct ieee80211_hw *hw, void *data, unsigned int len)
 
 	if (!cur_bcn_key->valid) {
 		/* update cur_beacon_keys */
-		memset(cur_bcn_key, 0, sizeof(bcn_key));
 		memcpy(cur_bcn_key, &bcn_key, sizeof(bcn_key));
 		cur_bcn_key->valid = true;