memory leak in function 'parse_options'

[JoraGevorgyan]

The memory leak is reported by a static analyzer tool developed at CAST
the allocated memory will left without free when the function fails to allocated another one, because in function 'ag_malloc' it checks if memory is not allocated and exits whole program

[plaukiu]

Leaks are of no importance for short running programs. They can actually improve performance as the OS reclaims the resources anyways.