Remove segfault from fmpq_mat/test/t-gso.c.
Remove segfault from fmpq_mat/test/t-gso.c.

jpflori/flint2,fredrik-johansson/flint2,wbhart/flint2,jpflori/flint2,dsroche/flint2,fredrik-johansson/flint2,jpflori/flint2,wbhart/flint2,jpflori/flint2,dsroche/flint2,wbhart/flint2,dsroche/flint2,dsroche/flint2,fredrik-johansson/flint2