pgbouncer - pgbouncer: Check error from event_init() to eliminate

Log Message:
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Check error from event_init() to eliminate warning on strict build

Modified Files:
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pgbouncer/src:
main.c (r1.62 -> r1.63)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/main.c?r1=1.62&r2=1.63)