mwifiex: fix leak of gen_ie storage on exit from mwifiex_del_mgmt_ies

Storage pointed to by gen_ie is allocated with kmalloc, but was
never freed.

Coverity CID #1271251

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Acked-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mwifiex/ie.c

@@ -479,6 +479,7 @@ int mwifiex_del_mgmt_ies(struct mwifiex_private *priv)
 						   ar_ie, &priv->assocresp_idx);
 
 done:
+	kfree(gen_ie);
 	kfree(beacon_ie);
 	kfree(pr_ie);
 	kfree(ar_ie);