9475 libefi: Do not return only if ReceiveFilter fails

Review Request #1074 - Created April 15, 2018 and updated

Information
Toomas Soome
illumos-gate
9475
8d59282...
Reviewers
general
https://svnweb.freebsd.org/base?view=revision&revision=331767

If the network interface or the uefi implementation do not support the
ReceiveFilter interface do not return only and just print a message.
U-Boot doesn't support is and likely never will. Also even if this fails
it doesn't mean that network in EFI isn't supported.

  
Andy Fiddaman
Ship It!
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