Added one more malloc test for freesasa_structure_array and fixed bug.
Added one more malloc test for freesasa_structure_array and fixed bug.

JoaoRodrigues/freesasa,mittinatten/freesasa,mittinatten/freesasa,mittinatten/freesasa,mittinatten/freesasa,JoaoRodrigues/freesasa,JoaoRodrigues/freesasa,JoaoRodrigues/freesasa