tests: fix caps leak in baseparse unit test
tests: fix caps leak in baseparse unit test

jpakkane/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,surround-io/gstreamer