gstcontext: Fix return values some more
gstcontext: Fix return values some more

Return value is a boolean not a pointer

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