added sanity checks to make sure _push and _pull don't get called on pads of the wrong direction
added sanity checks to make sure _push and _pull don't get called on pads of the wrong direction

Original commit message from CVS:
added sanity checks to make sure _push and _pull don't get called on pads of the wrong direction

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