[Bug 290141] if_bridge erroneously providing error

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290141

            Bug ID: 290141
           Summary: if_bridge erroneously providing error
           Product: Base System
           Version: 15.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pprocacci@gmail.com

Scenario here is:

Create a bridge without `vlanfilter'.

# ifconfig bridge1
bridge1: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric
0 mtu 1500
        options=10<VLAN_HWTAGGING>
        ether 58:9c:fc:10:df:aa
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        bridge flags=0<>
        member: epair2a flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                port 30 priority 128 path cost 2000 vlan protocol 802.1q
untagged 1843
        member: epair1a flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                port 14 priority 128 path cost 2000 vlan protocol 802.1q
        groups: bridge
        nd6 options=9<PERFORMNUD,IFDISABLED>



I added epair2a w/ `untagged 1843' to the bridge erroneously as shown above.
Went to remove the tag which yielded the following error:

# ifconfig bridge1 -ifuntagged epair2a 1843
ifconfig: ERROR: setting interface address without mask is no longer supported.


Though the tag removal was still successful:

# ifconfig bridge1
bridge1: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric
0 mtu 1500
        options=10<VLAN_HWTAGGING>
        ether 58:9c:fc:10:df:aa
        id 00:00:00:00:00:00 priority 32768 hellotime 2 fwddelay 15
        maxage 20 holdcnt 6 proto rstp maxaddr 2000 timeout 1200
        root id 00:00:00:00:00:00 priority 32768 ifcost 0 port 0
        bridge flags=0<>
        member: epair2a flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                port 30 priority 128 path cost 2000 vlan protocol 802.1q
        member: epair1a flags=143<LEARNING,DISCOVER,AUTOEDGE,AUTOPTP>
                port 14 priority 128 path cost 2000 vlan protocol 802.1q
        groups: bridge
        nd6 options=9<PERFORMNUD,IFDISABLED>

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