Fix string_ref::c_str() -- was checking the wrong char for 0 termination.
Fix string_ref::c_str() -- was checking the wrong char for 0 termination.

OpenImageIO/oiio,bdeluca/oiio,lgritz/oiio,micler/oiio,scott-wilson/oiio,bdeluca/oiio,lgritz/oiio,micler/oiio,cwilling/oiio,sambler/oiio,bdeluca/oiio,lgritz/oiio,sambler/oiio,scott-wilson/oiio,sambler/oiio,micler/oiio,micler/oiio,scott-wilson/oiio,cwilling/oiio,OpenImageIO/oiio,YangYangTL/oiio,OpenImageIO/oiio,mcanthony/oiio,mcanthony/oiio,bdeluca/oiio,YangYangTL/oiio,cwilling/oiio,OpenImageIO/oiio,cwilling/oiio,YangYangTL/oiio,sambler/oiio,YangYangTL/oiio,mcanthony/oiio,lgritz/oiio,mcanthony/oiio,scott-wilson/oiio