Summary:
- This PR fixes null pointer dereference in gs2200m.c
Impact:
- This PR affects gs2200m driver.
Testing:
- Use spresense:wifi and run gs2200m daemon in STA mode.
- Then execute 'renew eth0' to obtain DHCP address.
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>