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Followup on r281227. If we put the mbuf on queue, we must not return

Description

Followup on r281227. If we put the mbuf on queue, we must not return
an error, even of link is down. Returning an error now means give the
mbuf back to stack.

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Details

Provenance
glebiusAuthored on
Parents
rS281947: MFC r273973: vt(4): Fix keyboard allocation when kbdmux(4) isn't used
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