pgsql: Add missing va_end() call to a early exit in dmetaphone.c's Stri

Add missing va_end() call to a early exit in dmetaphone.c's StringAt().

Pointed out by Coverity.

Backpatch to all supported branches, the code has been that way for a
long while.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/58bc4747be26f6849ca38e67e24abdd6aecba3b1

Modified Files
--------------
contrib/fuzzystrmatch/dmetaphone.c | 3 +++
1 file changed, 3 insertions(+)

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