Bug 622008 - Don't trust is->select_folder in imapx_job_scan_changes_done()
Bug 622008 - Don't trust is->select_folder in imapx_job_scan_changes_done()

We may have already issued a new SELECT command by the time the scan_changes
completion function is called, and is->select_folder may be NULL already.

gcampax/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,gcampax/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,gcampax/evolution-data-server,matzipan/evolution-data-server,gcampax/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server