Log Message:-----------Fix insufficient check for overflow in tm2abstime(), per report from jw.
Modified Files:-------------- pgsql/src/backend/utils/adt: nabstime.c (r1.140 -> r1.141) (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/nabstime.c.diff?r1=1.140&r2=1.141)
