Initialize day of year value.

Michael Meskes <meskes@postgresql.org>

Commit: ffb28554c3be55b03cd4049c8e1379e636791d13
Author: Michael Meskes <meskes@postgresql.org>
Date: 2013-07-19T07:05:01Z
Releases: 9.0.14
Initialize day of year value.

There are cases where the day of year value in struct tm is used, but it never
got calculated. Problem found by Coverity scan.

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