In build_volume(), check if arrays is allocated before traversing its items.  While parsing the arrays input, it's possible that we reach the error path before initializing the 'arrays' pointer, which in turn leads to a NULL deference.
In build_volume(), check if arrays is allocated before traversing its
items.  While parsing the arrays input, it's possible that we reach the
error path before initializing the 'arrays' pointer, which in turn leads
to a NULL deference.

Submitted by:	Garrett Cooper
MFC after:	1 week

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