parse: fix for new GstChildProxy::child-added signal callback signature
parse: fix for new GstChildProxy::child-added signal callback signature

Fixes crash with gst-launch-1.0 uridecodebin uri=... suburi=... ! ..

collects/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,collects/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,justinjoy/gstreamer,krieger-od/gstreamer,cfoch/gstreamer,cablelabs/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,cfoch/gstreamer,krieger-od/gstreamer,jpxiong/gstreamer,cfoch/gstreamer,centricular/gstreamer,cfoch/gstreamer,collects/gstreamer,surround-io/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,lovebug356/gstreamer,StreamUtils/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,mparis/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,cfoch/gstreamer,krichter722/gstreamer,lovebug356/gstreamer,lovebug356/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,mparis/gstreamer,jpxiong/gstreamer,ensonic/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,mparis/gstreamer,lubosz/gstreamer,surround-io/gstreamer,centricular/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,mparis/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,ensonic/gstreamer,mparis/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,centricular/gstreamer,lubosz/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,cablelabs/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,ensonic/gstreamer,collects/gstreamer,surround-io/gstreamer,krichter722/gstreamer,collects/gstreamer