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(parent: 250c26b) | patch

Prevent shm_mq_send from reading uninitialized memory.

Prevent shm_mq_send from reading uninitialized memory.

shm_mq_send_bytes didn't invariably initialize *bytes_written before
returning, which would cause shm_mq_send to read from uninitialized
memory and add the value it found there to mqh->mqh_partial_bytes.
This could cause the next attempt to send a message via the queue to
fail an assertion (if the queue was detached) or copy data from a
garbage pointer value into the queue (if non-blocking mode was in use).

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