r351247: buildkernel failure: error: use of undeclared identifier 'miibus_statchg_XXXX

Recent CURRENT (r351247) fails to buildkernel due to a compilation error,
pointing to an mii issue.

For almost every mii-related if_ the compiler drops an error like:

[...]
Building
/usr/obj/usr/src/amd64.amd64/sys/WOTAN/modules/usr/src/sys/modules/usb/udl/udl.ko
===> usb/uether (all) Building
/usr/obj/usr/src/amd64.amd64/sys/WOTAN/modules/usr/src/sys/modules/usb/uether/uether.ko
===> usb/aue (all) Building
/usr/obj/usr/src/amd64.amd64/sys/WOTAN/modules/usr/src/sys/modules/usb/aue/if_aue.o
/usr/src/sys/dev/usb/net/if_aue.c:197:8: error: unknown type name
'miibus_readreg_t' static miibus_readreg_t aue_miibus_readreg; ^
/usr/src/sys/dev/usb/net/if_aue.c:198:8: error: unknown type name
'miibus_writereg_t' static miibus_writereg_t aue_miibus_writereg;
       ^
/usr/src/sys/dev/usb/net/if_aue.c:199:8: error: unknown type name
'miibus_statchg_t' static miibus_statchg_t aue_miibus_statchg;
       ^
/usr/src/sys/dev/usb/net/if_aue.c:262:2: error: use of undeclared identifier
'miibus_readreg_desc' DEVMETHOD(miibus_readreg, aue_miibus_readreg),
        ^
/usr/src/sys/sys/bus.h:751:19: note: expanded from macro 'DEVMETHOD'
#define DEVMETHOD       KOBJMETHOD
[...]


Seems the subfolder for USB NICs is missing something?

Kind regards,

oh