kernel 4.4.0-161-generic (i686) build problem

[Jorge Mireles]

Hello wireguard team!
After my linux box updated to kernel 4.40-161-generic wireguard stop
working.
I found dkms build reported a problem.
This is my /var/crash/wireguard-dkms.0.crash file content:

---------------------------------

ProblemType: Package
DKMSBuildLog:
 DKMS make.log for wireguard-0.0.20190702 for kernel 4.4.0-161-generic
(i686)
 Wed Sep  4 10:59:50 CDT 2019
 make: Entering directory '/usr/src/linux-headers-4.4.0-161-generic'
   LD      /var/lib/dkms/wireguard/0.0.20190702/build/built-in.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/main.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/noise.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/device.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/peer.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/timers.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/queueing.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/send.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/receive.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/socket.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/peerlookup.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o
 /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:25:8: error:
unknown type name ‘hsiphash_key_t’
  static hsiphash_key_t key;
         ^
 /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c: In function
‘wg_ratelimiter_allow’:
 /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:109:22: error:
implicit declaration of function ‘hsiphash_2u32’
[-Werror=implicit-function-declaration]
    bucket = &table_v4[hsiphash_2u32(net_word, ip, &key) &
                       ^
 /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:116:22: error:
implicit declaration of function ‘hsiphash_3u32’
[-Werror=implicit-function-declaration]
    bucket = &table_v6[hsiphash_3u32(net_word, ip >> 32, ip, &key) &
                       ^
 cc1: some warnings being treated as errors
 scripts/Makefile.build:285: recipe for target
'/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o' failed
 make[1]: *** [/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o]
Error 1
 Makefile:1454: recipe for target
'_module_/var/lib/dkms/wireguard/0.0.20190702/build' failed
 make: *** [_module_/var/lib/dkms/wireguard/0.0.20190702/build] Error 2
 make: Leaving directory '/usr/src/linux-headers-4.4.0-161-generic'
DKMSKernelVersion: 4.4.0-161-generic
Date: Wed Sep  4 10:59:58 2019
DuplicateSignature:
dkms:wireguard-dkms:0.0.20190702-wg1~xenial:/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:25:8:
error: unknown type name ‘hsiphash_key_t’
Package: wireguard-dkms 0.0.20190702-wg1~xenial
PackageVersion: 0.0.20190702-wg1~xenial
SourcePackage: wireguard
Title: wireguard-dkms 0.0.20190702-wg1~xenial: wireguard kernel module
failed to build

-------------------------

Is 4.4.0-161 buggy or something sources can need to be adjusted?
Thanks in advance
Jorge
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