[Bug 255430] ng_bridge don't sends broadcast packet to first found link in case of error in other links

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255430

            Bug ID: 255430
           Summary: ng_bridge don't sends broadcast packet to first found
                    link in case of error in other links
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dpslavov at hotmail.com

Created attachment 224454
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224454&action=edit
ng_bridge.c patch

When for some reason (including legitimate) sending manycast (in my case DHCP
reply broadcast) packet to one of multiple links of ng_bridge fails (for
example eiface is administratively brought down) the original packet isn't send
via first found link. This makes no sense for me as other links are tolerated
for errors. Attached patch changes this behavior as send the packet to all
links and keeps the logic to return the last seen error.

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