Test the soreceive_dgram tunable and set up the pr_usrreqs structure during UDP initialization, not during UDP inpcb initialization.
Test the soreceive_dgram tunable and set up the pr_usrreqs structure
during UDP initialization, not during UDP inpcb initialization.

Reported by:	Vlad GALU <dudu at dudu dot ro>
Approved by:	re (kib)

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