Remove useless return value

4 jobs for master in 1 minute and 17 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #417029
amd64 debian
build-debian

00:00:30

passed #417030
macos
build-macos

00:01:12

passed #417032
amd64 docker
build-win32

00:01:13

passed #417031
amd64 docker
build-win64

00:01:16