bufferpool: return empty metadata array
bufferpool: return empty metadata array

Return a string array with NULL instead of NULL from the default get_metas
function.

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