mwifiex: simplify length computation for some memset

This patch should be a no-op. It just simplifies code by using the name of
a variable instead of its type when calling 'sizeof'.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/sta_ioctl.c

@@ -574,7 +574,7 @@ int mwifiex_enable_hs(struct mwifiex_adapter *adapter)
 
 	adapter->hs_activate_wait_q_woken = false;
 
-	memset(&hscfg, 0, sizeof(struct mwifiex_ds_hs_cfg));
+	memset(&hscfg, 0, sizeof(hscfg));
 	hscfg.is_invoke_hostcmd = true;
 
 	adapter->hs_enabling = true;
@@ -1138,7 +1138,7 @@ int mwifiex_set_encode(struct mwifiex_private *priv, struct key_params *kp,
 {
 	struct mwifiex_ds_encrypt_key encrypt_key;
 
-	memset(&encrypt_key, 0, sizeof(struct mwifiex_ds_encrypt_key));
+	memset(&encrypt_key, 0, sizeof(encrypt_key));
 	encrypt_key.key_len = key_len;
 	encrypt_key.key_index = key_index;