dashdemux: Properly initalize GError

Part-of: <gstreamer/gst-plugins-bad!2479>
29 jobs for !2479 with backport-mr-2476-into-1.18-dash-gerror in 24 minutes and 34 seconds (queued for 3 seconds)
detached
Status Name Job ID Coverage
  Build Docker
passed alpine amd64 manifest builder docker #13007289

00:00:37

passed android docker #13007288

00:00:37

passed cerbero fedora amd64 docker #13007287

00:00:34

passed fedora amd64 docker #13007286

00:00:36

passed gst-indent amd64 docker #13007290

00:00:34

 
  Preparation
passed gst indent #13007292

00:00:28

passed manifest #13007291

00:00:29

 
  Build
passed build cerbero cross-android universal #13007301
gstreamer

00:08:14

passed build cerbero cross-ios universal #13007305
gst-ios-14.3

00:18:45

passed build cerbero cross win32 #13007302
gstreamer

00:05:52

passed build cerbero cross win64 #13007303
gstreamer

00:05:54

passed build cerbero fedora x86_64 #13007300
gstreamer

00:05:52

passed build cerbero macos x86_64 #13007304
gst-macos-11.1

00:11:40

passed build clang fedora x86_64 #13007296

00:06:12

manual build msys2 #13007299
docker windows 1809 allowed to fail manual
passed build nodebug fedora x86_64 #13007293

00:06:59

passed build static fedora x86_64 #13007294

00:06:58

passed build static nodebug fedora x86_64 #13007295

00:06:58

passed build vs2017 amd64 #13007297
docker windows 1809

00:09:11

passed build vs2017 x86 #13007298
docker windows 1809

00:09:22

 
  Test
passed check fedora #13007306
gstreamer

00:07:11

passed integration testsuites fedora 1/4 #13007307
gstreamer

00:07:41

passed integration testsuites fedora 2/4 #13007308
gstreamer

00:09:39

passed integration testsuites fedora 3/4 #13007309
gstreamer

00:07:30

passed integration testsuites fedora 4/4 #13007310
gstreamer

00:07:22

passed valgrind bad #13007311
gstreamer

00:06:34

 
  Integrate
passed cross-android universal examples #13007312

00:06:27

passed cross-ios universal examples #13007314
gst-ios-14.3

00:04:31

passed documentation #13007313

00:14:52