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2d475b3dcd
On 8-bit and 16-bit platforms `uint32_t` is wider than `void *`, as
pointers are (typically) only 16 bit in size. This causes output like:
Message queue of thread 2
size: 8 (avail: 8)
* 0: sender: 2, type: 0x0000, content: 2701197312 (0)
* 1: sender: 2, type: 0x0001, content: 2701197313 (0x1)
As seen here, the leading two bytes of `msg.content.value` contain
"random" bits, as those bytes are not explicitly initialized.
This fixes the issue by explicitly initializing the whole `msg_t` via
an initializer list.