pgbouncer - pgbouncer: avoid recv() if buffer has data

Log Message:
-----------
avoid recv() if buffer has data

Modified Files:
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pgbouncer/src:
sbuf.c (r1.14 -> r1.15)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/sbuf.c.diff?r1=1.14&r2=1.15)