Fix a memory leak in the test code for fmpz_poly_signature
Fix a memory leak in the test code for fmpz_poly_signature

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