pad: fix variable-set-but-not-used compiler warning
pad: fix variable-set-but-not-used compiler warning

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