fix params of ep_get_mac_addr

Signed-off-by: Adam Wujek <dev_public@wujek.eu>
3 jobs from adam-wrpc-v5 in 55 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Compile
passed #1581
wrs_sw
make_all

00:55

failed #1582
wrs_sw
make_rt_cpu

00:18

passed #1580
wrs_sw
make_wrpc_sw

00:36