ghostpad: Make sure that nobody sets the proxypad or ghostpad itself as target
ghostpad: Make sure that nobody sets the proxypad or ghostpad itself as target

Doing this will lead to very interesting crashes, like stack overflows.

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