Initialize day of year value.

Michael Meskes <meskes@postgresql.org>

Commit: d29130bd0f099e0ba973e933bf39b719e2378968
Author: Michael Meskes <meskes@postgresql.org>
Date: 2013-07-19T07:04:39Z
Releases: 8.4.18
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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