Fix kqueue handling of no timeout
Fix kqueue handling of no timeout

Using a tiemout value of 0 when there was no timeout caused busy
looping int the eventhandler thread as that actually ment
immediate timeout. No timeout is specified using NULL.

BUG=dart:1641

R=iposva@google.com

TEST=

Review URL: https://chromiumcodereview.appspot.com//9350034

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@4176 260f80e4-7a28-3924-810f-c04153c831b5

dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk