pgsql: Fix uninitialized-variable warning.

Fix uninitialized-variable warning.

In passing, add an Assert defending the presumption that bytes_left
is positive to start with. (I'm not exactly convinced that using an
unsigned type was such a bright thing here, but let's at least do
this much.)

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/d934a052348c1fa017ff677d08e74c643e3f416c

Modified Files
--------------
src/backend/utils/misc/guc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

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