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Fix race condition in watch_add_notify

kn requested to merge kunjan/glib:main into main

watch_add_notify gets the GNode with the cache_lock but then relesaes the cache_lock and acquires message_lock. Before that thread can acquire the message_lock another thread can call watch_remove_notify and remove the same prefix causing the GNode that was returned to thread 1 to be stale/bad.

Thread1 would then set the watch-> = cache_node; when it sends it's notifications.

This leads to the assert log and subsequently a corruption downstream

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