selftests: netconsole: Increase port listening timeout

wait_for_port() can wait up to 2 seconds with the sleep and the polling
in wait_local_port_listen() combined. So, in netcons_basic.sh, the socat
process could die before the test writes to the netconsole.

Increase the timeout to 3 seconds to make netcons_basic.sh pass
consistently.

Fixes: 3dc6c76391 ("selftests: net: Add IPv6 support to netconsole basic tests")
Signed-off-by: Pin-yen Lin <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh

@@ -249,8 +249,8 @@ function listen_port_and_save_to() {
 		SOCAT_MODE="UDP6-LISTEN"
 	fi
 
-	# Just wait for 2 seconds
-	timeout 2 ip netns exec "${NAMESPACE}" \
+	# Just wait for 3 seconds
+	timeout 3 ip netns exec "${NAMESPACE}" \
 		socat "${SOCAT_MODE}":"${PORT}",fork "${OUTPUT}" 2> /dev/null
 }