wifi_drv: use relative timeout in poll function

The vanilla 'schedule_timeout()' Linux function expects a relative
timeout value. The first implementation of the wifi_drv, however, used
an absolute timeout value. This mismatch was overlooked when the
lx_kit, which adheres to the vanilla Linux semantics, was incoporated
in the driver.

Fixes #1990.

repos/dde_linux/src/lib/wifi/socket_call.cc

@@ -306,7 +306,7 @@ class Lx::Socket
 					sock->sk->sk_wq = &wq[i];
 				}
 
-				long t = jiffies + msecs_to_jiffies(timeout);
+				long t = msecs_to_jiffies(timeout);
 				timeout_triggered = !schedule_timeout(t);
 
 				task->wait_dequeue(&wait_list);