fixed a double-unreffing problem when disposing of elements
fixed a double-unreffing problem when disposing of elements

Original commit message from CVS:
fixed a double-unreffing problem when disposing of elements

justinjoy/gstreamer,centricular/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,magcius/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,mrchapp/gstreamer,cfoch/gstreamer,cablelabs/gstreamer,mrchapp/gstreamer,drothlis/gstreamer,lovebug356/gstreamer,mparis/gstreamer,cfoch/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,cfoch/gstreamer,collects/gstreamer,collects/gstreamer,shelsonjava/gstreamer,krichter722/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,ahmedammar/platform_external_gst_gstreamer,collects/gstreamer,collects/gstreamer,centricular/gstreamer,Lachann/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,mrchapp/gstreamer,drothlis/gstreamer,cablelabs/gstreamer,krieger-od/gstreamer,magcius/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,Distrotech/gstreamer,krieger-od/gstreamer,ensonic/gstreamer,cablelabs/gstreamer,magcius/gstreamer,surround-io/gstreamer,ahmedammar/platform_external_gst_gstreamer,Distrotech/gstreamer,lubosz/gstreamer,mparis/gstreamer,lovebug356/gstreamer,drothlis/gstreamer,ahmedammar/platform_external_gst_gstreamer,drothlis/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,ylatuya/gstreamer,ahmedammar/platform_external_gst_gstreamer,lubosz/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,lubosz/gstreamer,ylatuya/gstreamer,drothlis/gstreamer,magcius/gstreamer,magcius/gstreamer,jpakkane/gstreamer,ylatuya/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,krichter722/gstreamer,cfoch/gstreamer,centricular/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,cfoch/gstreamer,Lachann/gstreamer,mrchapp/gstreamer,Lachann/gstreamer,lovebug356/gstreamer,mparis/gstreamer,ensonic/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,ahmedammar/platform_external_gst_gstreamer,jpakkane/gstreamer,jpakkane/gstreamer,ylatuya/gstreamer,mparis/gstreamer,ensonic/gstreamer,lovebug356/gstreamer,mrchapp/gstreamer,lubosz/gstreamer,Lachann/gstreamer,mparis/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,Distrotech/gstreamer,jpxiong/gstreamer,centricular/gstreamer,Distrotech/gstreamer,cablelabs/gstreamer,collects/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,Distrotech/gstreamer,ylatuya/gstreamer,lubosz/gstreamer,jpakkane/gstreamer