The version you used is before the fix -- the commit id in your version points to:
``` commit 4c537a618949eb48ffed9297f3abc8cdc879b70d Author: Daniel-Constantin Mierla miconda@gmail.com Date: Tue Aug 6 21:37:56 2019 +0200
misc_radius: increase MAX_EXTRA from 4 to 8 ```
To have the version with the fix, it has to be after the commit:
``` commit c79dfbeab0bfefaa4dd5cefc41cba3ba157da0ce Author: Daniel-Constantin Mierla miconda@gmail.com Date: Mon Aug 12 11:18:39 2019 +0200
corex: free old outbound buffer inside SREV_NET_DATA_OUT callback ```