pgsql: Fix missing PQclear() in libpqrcv_endstreaming().

Fix missing PQclear() in libpqrcv_endstreaming().

This omission leaked one PGresult per WAL streaming cycle, which possibly
would never be enough to notice in the real world, but it's still a leak.

Per Coverity. Back-patch to 9.3 where the error was introduced.

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/734bbf2e978314cad86e1dd8fefe7f0c3f52a4ef

Modified Files
--------------
src/backend/replication/libpqwalreceiver/libpqwalreceiver.c | 1 +
1 file changed, 1 insertion(+)

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