controller: Fix the function signature and a minor typo fix
controller: Fix the function signature and a minor typo fix

https://bugzilla.gnome.org/show_bug.cgi?id=699827

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