pgsql: Clean up possibly-uninitialized-variable warnings reported by gcc

Log Message:
-----------
Clean up possibly-uninitialized-variable warnings reported by gcc 4.x.

Modified Files:
--------------
pgsql/src/backend/access/nbtree:
nbtinsert.c (r1.124 -> r1.125)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/nbtree/nbtinsert.c.diff?r1=1.124&r2=1.125)
pgsql/src/backend/catalog:
pg_proc.c (r1.132 -> r1.133)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/pg_proc.c.diff?r1=1.132&r2=1.133)
pgsql/src/backend/commands:
copy.c (r1.250 -> r1.251)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/copy.c.diff?r1=1.250&r2=1.251)
functioncmds.c (r1.67 -> r1.68)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/functioncmds.c.diff?r1=1.67&r2=1.68)
tablecmds.c (r1.170 -> r1.171)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c.diff?r1=1.170&r2=1.171)
pgsql/src/backend/optimizer/path:
indxpath.c (r1.189 -> r1.190)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/indxpath.c.diff?r1=1.189&r2=1.190)
pgsql/src/backend/optimizer/plan:
createplan.c (r1.197 -> r1.198)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c.diff?r1=1.197&r2=1.198)
planner.c (r1.192 -> r1.193)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/planner.c.diff?r1=1.192&r2=1.193)
pgsql/src/backend/regex:
rege_dfa.c (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/regex/rege_dfa.c.diff?r1=1.4&r2=1.5)
regexec.c (r1.25 -> r1.26)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/regex/regexec.c.diff?r1=1.25&r2=1.26)
pgsql/src/backend/utils/adt:
inet_net_ntop.c (r1.19 -> r1.20)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/inet_net_ntop.c.diff?r1=1.19&r2=1.20)
nabstime.c (r1.142 -> r1.143)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/nabstime.c.diff?r1=1.142&r2=1.143)
selfuncs.c (r1.188 -> r1.189)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/selfuncs.c.diff?r1=1.188&r2=1.189)
pgsql/src/backend/utils/cache:
catcache.c (r1.123 -> r1.124)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/cache/catcache.c.diff?r1=1.123&r2=1.124)
pgsql/src/backend/utils/misc:
guc.c (r1.288 -> r1.289)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/guc.c.diff?r1=1.288&r2=1.289)
pgsql/src/interfaces/ecpg/pgtypeslib:
datetime.c (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/datetime.c.diff?r1=1.23&r2=1.24)
pgsql/src/pl/plpgsql/src:
pl_comp.c (r1.92 -> r1.93)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/pl_comp.c.diff?r1=1.92&r2=1.93)