caps: Fix compiler warning
caps: Fix compiler warning

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