facebook/facebook-ios-sdk — pull request #503 by erydo (2012-11-19 03:05:30+00:00)
Title: Fix crashing bug in FBLoginView when deallocated and session.state changes.

FBLoginView now removes KVO observing from self.session.
Previously, a crash would occur when:
1) An FBLoginView was associated with a session.
2) That FBLoginView was deallocated.
3) session.state changed.