mwifiex: fix copy-n-paste 'thinko' for tsf_val

  CC [M]  drivers/net/wireless/mwifiex/join.o
drivers/net/wireless/mwifiex/join.c: In function ‘mwifiex_cmd_802_11_associate’:
drivers/net/wireless/mwifiex/join.c:119:8: warning: ‘tsf_val’ may be used uninitialized in this function
drivers/net/wireless/mwifiex/join.c:103:12: note: ‘tsf_val’ was declared here

Looks like a copy-n-paste error, identical lines are a few lines below
the ones removed, with an actual memcpy to tsf_val in between...
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/join.c

@@ -116,9 +116,6 @@ mwifiex_cmd_append_tsf_tlv(struct mwifiex_private *priv, u8 **buffer,
 	memcpy(*buffer, &tsf_tlv, sizeof(tsf_tlv.header));
 	*buffer += sizeof(tsf_tlv.header);
 
-	memcpy(*buffer, &tsf_val, sizeof(tsf_val));
-	*buffer += sizeof(tsf_val);
-
 	memcpy(&tsf_val, bss_desc->time_stamp, sizeof(tsf_val));
 
 	dev_dbg(priv->adapter->dev, "info: %s: TSF offset calc: %016llx - "