MFC:	sys/kern/vfs_syscalls.c	1.393
MFC:	sys/kern/vfs_syscalls.c	1.393

In case of mac_check_vnode_rename_from() or vn_start_write() failure,
vn_finished_write() should not be called.

Reviewed by:	ssouhlal
Approved by:	re (scottl)

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