FreeBSD/src c982e56 (r351388)sys/dev/usb/net usb_ethernet.h

usb: fix usb_fdt_support.c when altq enabled (usb_ehernet.h changes)

After r351243 when ALTQ was enabled in the kernel, the inline functions
in ifq.h would not have full type information as if_var.h was not
included.

Given usb_ethernet.h already includes all the various headers (which)
is the cause of the problem here, add if_var.h to it.  This fixes the
builds again.

Reported by:    CI system, e.g. FreeBSD-head-aarch64-LINT
DeltaFile
+1-0sys/dev/usb/net/usb_ethernet.h
+1-01 files

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