GVariantTypeInfo: fix thread safety bug
Issue caught by Michael Meeks. This patch based on his. GVariantTypeInfo was dropping the reference count on the TypeInfo structure before removing it from the hash table. This means that another thread could come along and grab the value from the hash table in the meantime. Solve this by holding the lock on the table before dropping the reference. Also: move the hash table initialisation inside of the lock to remove the standard double-initialisation race plus a more insidious issue caused by the fact that we free the hash table once it becomes empty.
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