presence: fix multiple double free on shutdown caught with memlog=1 #754
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These small changes fix the bug shown below and another potential one.
kamailio[3062]: : [mem/q_malloc.c:453]: qm_free(): BUG: qm_free: freeing already freed pointer (0x7facf958dc08), called from presence: hash.c: delete_shtable(316), first free presence: hash.c: free_subs_list(349) - aborting
It's the double free apocalypse day :)