framepositioner: Fix runtime warning

GstCaps is not a GObject!

Part-of: <gstreamer/gst-editing-services!239>
30 jobs for !239 with backport-mr-238-into-1.18-fix-warning in 52 minutes and 30 seconds (queued for 7 seconds)
detached
Status Job ID Name Coverage
  Build Docker
passed #8861522
alpine amd64 manifest builder docker

00:00:20

passed #8861521
android docker

00:00:26

passed #8861520
cerbero fedora amd64 docker

00:00:23

passed #8861519
fedora amd64 docker

00:00:19

passed #8861523
gst-indent amd64 docker

00:00:18

 
  Preparation
passed #8861525
gst indent

00:00:16

passed #8861524
manifest

00:00:25

 
  Build
passed #8861534
gstreamer
build cerbero cross-android universal

00:08:48

passed #8861538
gst-ios-14.3
build cerbero cross-ios universal

00:29:12

passed #8861535
gstreamer
build cerbero cross win32

00:08:43

passed #8861536
gstreamer
build cerbero cross win64

00:06:54

passed #8861533
gstreamer
build cerbero fedora x86_64

00:06:56

passed #8861537
gst-macos-11.1
build cerbero macos x86_64

00:16:29

passed #8861529
build clang fedora x86_64

00:06:06

manual #8861532
docker windows 1809 allowed to fail manual
build msys2
passed #8861526
build nodebug fedora x86_64

00:07:58

passed #8861527
build static fedora x86_64

00:07:58

passed #8861528
build static nodebug fedora x86_64

00:07:58

passed #8861530
docker windows 1809
build vs2017 amd64

00:12:44

passed #8861531
docker windows 1809
build vs2017 x86

00:13:09

 
  Test
passed #8861539
gstreamer
check fedora

00:06:58

passed #8861540
gstreamer
integration testsuites fedora 1/4

00:14:02

passed #8862511
gstreamer
integration testsuites fedora 2/4

00:17:28

passed #8861542
gstreamer
integration testsuites fedora 3/4

00:12:46

passed #8861543
gstreamer
integration testsuites fedora 4/4

00:16:12

passed #8861545
gstreamer
valgrind ges

00:05:40

failed #8861541
gstreamer
integration testsuites fedora 2/4

00:21:35

 
  Integrate
passed #8861548
cross-android universal examples

00:07:36

passed #8861552
gst-ios-14.3
cross-ios universal examples

00:04:41

passed #8861550
documentation

00:14:02