bitreader: Fix uninitialized variable compiler warnings
bitreader: Fix uninitialized variable compiler warnings

gcc doesn't notice that the check assertion macros will abort
further execution of the tests.

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