rmaga points outside rzl_array for lasym with ntor = 0

[CharlesCNorton]

! eqfor.f90:72-75
  IF (lasym) THEN
    rmaga => rzl_array(1,:,0,rcs)
    zmaga => rzl_array(1,:,0,zcc+ntmax)
  END IF

For LASYM = T with NTOR = 0, read_indata.f90:123-124 sets ntmax = 2, rsc = 2, zcc = 2 and leaves rcs at the 0 from read_indata.f90:105, since the cos(mu)sin(nv) basis does not exist without toroidal modes. The pointer then targets type index 0 of a dimension declared 1:3*ntmax.

Built with -fcheck=all, input.up_down_asymmetric_tokamak (VMEC++ test data; any lasym input with ntor = 0 does the same) stops at eqfor.f90:73:

Fortran runtime error: Index '0' of dimension 4 of array 'rzl_array' outside of expected range (1:6)

A release build reads the memory before the array. The value reaches eqfor.f90:751 (rax_asym(n) = -tz*rmaga(n1)) and the threed1 axis table at eqfor.f90:759, where the n = 0 factor tz = 0 hides it, so the table prints -0.0000E+00. The 2017 VMEC2000 8.52 source (eqfor.f:82) and PARVMEC carry the same association; associating rmaga only when rcs > 0 and using zero otherwise covers the ntor = 0 case.