hostapd: fix P2P group information processing vulnerability
A vulnerability was discovered in how wpa_supplicant processing P2P
(Wi-Fi Direct) group information from active group owners.
This issue was discovered by fuzz testing of wpa_supplicant by Google's
OSS-Fuzz.
https://w1.fi/security/2020-2/wpa_supplicant-p2p-group-info-processing-vulnerability.txt
Signed-off-by: Daniel Golle <[email protected]>