ludocode / mpack / 621

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Fixed invalid access in growing node tree data

This fixes a critical bug that could occur when a tree's data buffer
grows, when the last byte in the buffer is the type byte of a node, and
additional bytes are required for that same node, and reallocating the
buffer moves it. This would cause an invalid access reading the data,
causing data corruption or a crash.

(This is hard to test or reproduce since the tree does not shrink the
buffer between messages, so once the buffer grows to the maximum size
the bug is no longer reproducible.)

26 of 26 new or added lines in 1 file covered. (100.0%)

3260 of 3485 relevant lines covered (93.54%)

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