Mark Johnston 20b5f02214 Clean up callers of nd6_prelist_add().
nd6_prelist_add() sets *newp if and only if it is successful, so there's no
need for code that handles the case where the return value is 0 and
*newp == NULL. Fix some style bugs in nd6_prelist_add() while here.

MFC after:	1 week
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