Memory leak in allocate_interpreter

[nwellnhof]

$ valgrind --leak-check=full ./parrot t/op/interp_2.pir
[...]
==22134== 789,400 (212 direct, 789,188 indirect) bytes in 1 blocks are definitely lost in loss record 1,075 of 1,075
==22134==    at 0x402328F: calloc (vg_replace_malloc.c:467)
==22134==    by 0x40877B9: mem_sys_allocate_zeroed (alloc_memory.c:83)
==22134==    by 0x4090788: allocate_interpreter (inter_create.c:124)
==22134==    by 0x40908C8: make_interpreter (inter_create.c:92)
==22134==    by 0x40DB6CC: create_interp (parrotinterpreter.pmc:183)
==22134==    by 0x40DB7C8: Parrot_ParrotInterpreter_init (parrotinterpreter.pmc:252)
==22134==    by 0x40BAB52: Parrot_pmc_new (pmc.c:164)
==22134==    by 0x4069CC2: Parrot_new_p_sc (core_ops.c:20664)
==22134==    by 0x40BBE74: runops_slow_core (cores.c:647)
==22134==    by 0x40BB78D: runops_int (main.c:237)
==22134==    by 0x409116C: runops (ops.c:127)
==22134==    by 0x408D2D6: Parrot_pcc_invoke_from_sig_object (pcc.c:325)
==22134==