A change to MSI-X link handler was somehow causing issues on
MSI-based em(4) NICs.

Revert the change based on user reports and testing.

PR:		258551
Reported by:	Franco Fichtner <franco@opnsense.org>, t_uemura@macome.co.jp
Reviewed by:	markj, Franco Fichtner <franco@opnsense.org>
Tested by:	t_uemura@macome.co.jp
MFC after:	1 day