Locking: Use single global lock instead of context lock #1470
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When context is de-allocated, other threads can still access the context lock held within context. Indicating being freed when coap_free_context() was called worked in most cases, but not all.
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When context is de-allocated, other threads can still access the context lock held within context. Indicating being freed when coap_free_context() was called worked in most cases, but not all.