subdivisionTablesFactory: Fix typo in assert
subdivisionTablesFactory: Fix typo in assert

takahito-tejima/OpenSubdiv-exp,nyotis/OpenSubdiv,lookup1980/OpenSubdiv,c64kernal/OpenSubdiv,c64kernal/OpenSubdiv,poljere/OpenSubdiv,xldeveloper/OpenSubdiv,nyotis/OpenSubdiv,anshuarya/OpenSubdiv,poljere/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,poljere/OpenSubdiv,jcowles/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,jcowles/OpenSubdiv,shengfuintel/OpenSubdiv,takahito-tejima/OpenSubdiv,lookup1980/OpenSubdiv,xldeveloper/OpenSubdiv,takahito-tejima/OpenSubdiv,shengfuintel/OpenSubdiv,xldeveloper/OpenSubdiv,jcowles/OpenSubdiv,lookup1980/OpenSubdiv,anshuarya/OpenSubdiv,anshuarya/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,shengfuintel/OpenSubdiv,c64kernal/OpenSubdiv,nyotis/OpenSubdiv,takahito-tejima/OpenSubdiv