Fix an ancient typo that prevented the detection of conflicting fields when

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 12dbe763f31af809731a0cc2493a08091bebd4ea
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-08-02T01:25:02Z
Releases: 9.0.0
Fix an ancient typo that prevented the detection of conflicting fields when
interval input "invalid" was specified together with other fields.  Spotted
by Neil Conway with the help of a clang warning.  Although this has been
wrong since the interval code was written more than 10 years ago, it doesn't
affect anything beyond which error message you get for a wrong input, so not
worth back-patching very far.

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