Fix more memory leaks.

These were more significant than the previous leak because these were
in the loop and leaking memory for every message being parsed. It
turns out that g_hash_table_new should probably be named
g_hash_table_new_and_leak_memory_please. The actually useful function
is g_hash_table_new_full which lets us pass a free function, (to free
keys when inserting duplicates into the hash table). And after all,
weeding out duplicates is the only reason we are using this hash table
in the first place.

It almost goes without saying, valgrind found these leaks.

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