arch/xtensa/espressif: fix Wi-Fi netpkt copy error

Fix an issue where netpkt copy would fail due to wrong
return checking condition.

Signed-off-by: Filipe Cavalcanti <filipe.cavalcanti@espressif.com>
diff --git a/arch/xtensa/src/common/espressif/esp_wlan_netdev.c b/arch/xtensa/src/common/espressif/esp_wlan_netdev.c
index 60e5c37..29a1dfd 100644
--- a/arch/xtensa/src/common/espressif/esp_wlan_netdev.c
+++ b/arch/xtensa/src/common/espressif/esp_wlan_netdev.c
@@ -1019,7 +1019,7 @@
     }
 
   ret = netpkt_copyin(&priv->dev, pkt, buffer, len, 0);
-  if (ret != OK)
+  if (ret < 0)
     {
       wlerr("ERROR: Failed to copy packet\n");
       goto out;