staging: wilc1000: handle freeing of key data in wilc_add_ptk()

Handle freeing of memory allocated to store the 'key' in wilc_add_ptk()
function. Once work completion notification is received, free the
memory allocated to avoid missing of free in work function sepecially
for error scenario.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -1724,7 +1724,6 @@ out_wpa_rx_gtk:
 
 out_wpa_ptk:
 		complete(&msg->work_comp);
-		kfree(hif_key->attr.wpa.key);
 		break;
 
 	case PMKSA:
@@ -2735,8 +2734,6 @@ int wilc_add_ptk(struct wilc_vif *vif, const u8 *ptk, u8 ptk_key_len,
 	}
 
 	wait_for_completion(&msg->work_comp);
-	kfree(msg);
-	return 0;
 
 free_key:
 	kfree(msg->body.key_info.attr.wpa.key);