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(parent: 0e141c0) | patch

Fix incorrect calculation in shm_mq_receive.

Fix incorrect calculation in shm_mq_receive.

If some, but not all, of the length word has already been read, and the
next attempt to read sees exactly the number of bytes needed to complete
the length word, or fewer, then we'll incorrectly read less than all of
the available data.

Antonin Houska

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