baseparse: Remove always-true-checks
baseparse: Remove always-true-checks

a gsize is guaranteed to be positive on all systems since it's an
unsigned value.

CID #1037147

jpxiong/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,krichter722/gstreamer,cfoch/gstreamer,mparis/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,Lachann/gstreamer,cablelabs/gstreamer,jpakkane/gstreamer,mparis/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,surround-io/gstreamer,centricular/gstreamer,Lachann/gstreamer,cfoch/gstreamer,surround-io/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,mparis/gstreamer,cfoch/gstreamer,cfoch/gstreamer,jpxiong/gstreamer,cfoch/gstreamer,jpxiong/gstreamer,surround-io/gstreamer,centricular/gstreamer,centricular/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,shelsonjava/gstreamer,Lachann/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,centricular/gstreamer,mparis/gstreamer,centricular/gstreamer,cablelabs/gstreamer,Lachann/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,Lachann/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer