onvif-media: fix "void function returning a value" compiler warning

16 jobs for fix-void-function-returning-value-compiler-warning in 33 minutes (queued for 1 second)
Status Job ID Name Coverage
  Preparation
passed #380471
gst indent

00:00:17

passed #380470
manifest

00:00:40

 
  Build
passed #380477
build cerbero android universal

00:13:12

passed #380478
build cerbero cross win32

00:07:19

passed #380479
build cerbero cross win64

00:05:18

passed #380476
build cerbero fedora x86_64

00:08:59

manual #380481
gst-ios-12.2 allowed to fail manual
build cerbero ios universal
passed #380480
gst-macos-10.14
build cerbero macos x86_64

00:06:32

passed #380472
build fedora x86_64

00:09:45

passed #380473
build nodebug fedora x86_64

00:08:12

passed #380474
build static fedora x86_64

00:16:31

passed #380475
build static nodebug fedora x86_64

00:13:38

 
  Test
passed #380482
check fedora

00:03:34

passed #380483
integration testsuites fedora

00:09:06

 
  Integrate
passed #380484
android universal examples

00:06:41

passed #380485
documentation

00:04:34