Handle one more case of a fifofs filetmp: set filetmp.f_cred to ap->a_cred, and pass in ap->a_td->td_ucred as the active_cred to soo_poll().
Handle one more case of a fifofs filetmp: set filetmp.f_cred to
ap->a_cred, and pass in ap->a_td->td_ucred as the active_cred to
soo_poll().

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

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