LAPACKE_*tgsen iwork not allocated for ijob = 0

[mgates3]

Description
In LAPACKE_*tgsen, if ijob = 0, no iwork is allocated:
https://github.com/Reference-LAPACK/lapack/blob/master/LAPACKE/src/lapacke_dtgsen.c#L86-L92

However, liwork = 1 and iwork( 1 ) is written to:
https://github.com/Reference-LAPACK/lapack/blob/master/SRC/dtgsen.f#L571-L575

One simple solution is to set

lapack_int* iwork = &iwork_query;

For ijob == 0, only that one entry is needed; for ijob != 0, iwork will get allocated. Though I would also change the two if (ijob != 0) conditions to if (liwork > 1) for safety & clarity.

Alternatively, delete the two if (ijob != 0) conditions:
https://github.com/Reference-LAPACK/lapack/blob/master/LAPACKE/src/lapacke_dtgsen.c#L86
https://github.com/Reference-LAPACK/lapack/blob/master/LAPACKE/src/lapacke_dtgsen.c#L106
and always malloc iwork, even when liwork = 1.

This was discovered in writing the LAPACK++ wrapper (tgsen not yet pushed). The routine works for ijob = 1, 2, 3, 4, 5 but segfaults for ijob = 0:

thyme lapackpp/test> ./tester --ijob 1,2,3,4,5,0 --dim 10 tgsen
LAPACK++ version 2022.07.00, id c878e31
input: ./tester --ijob '1,2,3,4,5,0' --dim 10 tgsen
                                                                              
type   ijob  jobvl  jobvr       n     error   time (s)  ref time (s)  status  
   d      1  novec  novec      10  0.00e+00   0.000764      0.000653  pass    
   d      2  novec  novec      10  0.00e+00    0.00156       0.00158  pass    
   d      3  novec  novec      10  0.00e+00    0.00287       0.00285  pass    
   d      4  novec  novec      10  0.00e+00    0.00123       0.00111  pass    
   d      5  novec  novec      10  0.00e+00    0.00324       0.00294  pass    
Segmentation fault

Checklist

• I've included a minimal example to reproduce the issue
• I'd be willing to make a PR to solve this issue