ghostpad: don't unref NULL caps
ghostpad: don't unref NULL caps

Caps can be NULL so don't call unref on it unconditionally, instead use an
existing exit pad for the function.

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