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F_MALLOC: Recover from double pointer free
This patch makes F_MALLOC more robust in production by avoiding memory corruption in case of double free operations. Previously, the hash state would immediately get corrupted on such operations, and it would only be a matter of time before the allocator would crash in some random place with a useless backtrace resembling: \#0 0x0000000000507209 in fm_remove_free (qm=0x7f7d578d2010, size=56) at mem/f_malloc.c:200 200 *pf=n->u.nxt_free; When DBG_MALLOC is defined, F_MALLOC will now abort() on a double free, similar to QM_MALLOC.
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