query: fix gst_query_parse_nth_allocation_pool() annotation
query: fix gst_query_parse_nth_allocation_pool() annotation

It returns a ref to the pool.

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