Merge pull request #134 from artemyto/kernel_5_12

Add kernel 5.12 compatibility

os_dep/linux/recv_linux.c

@@ -355,7 +355,11 @@ static int napi_recv(_adapter *padapter, int budget)
 
 #ifdef CONFIG_RTW_GRO
 		if (pregistrypriv->en_gro) {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0))
+			if (rtw_napi_gro_receive(&padapter->napi, pskb) != GRO_MERGED_FREE)
+#else
 			if (rtw_napi_gro_receive(&padapter->napi, pskb) != GRO_DROP)
+#endif
 				rx_ok = _TRUE;
 			goto next;
 		}