childproxy: fix signal parameter types
childproxy: fix signal parameter types

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