gtx_ptx.cpp: fix switch default label and operator precedence in ncores().
gtx_ptx.cpp: fix switch default label and operator precedence in ncores().

wdv4758h/ZipPy,wdv4758h/ZipPy,wdv4758h/ZipPy,wdv4758h/ZipPy,wdv4758h/ZipPy,wdv4758h/ZipPy,wdv4758h/ZipPy,wdv4758h/ZipPy