Too many stray irq7

Hello,

Since I run current on my box (around june), I've got this message "Too
many stray irq7, not logging anymore" when booting the box.

This is not a real problem, but that looks strange because there is no
device at all on IRQ7 ?

$ devinfo -u
Interrupt request lines:
    0 (root0)
    1 (atkbd0)
    3 (uart1)
    4 (uart0)
    5 (vr1)
    6-7 (root0)
    8 (atrtc0)
    9 (vr2)
    10 (root0)
    11 (vr0)
    12 (vr3)
    13 (root0)
    14 (ata0)
    15 (ata1)

It's on a Soekris net5501 box without printer port. With FreeBSD
7-STABLE, I don't remember any warning for stray irq.

Thanks, regards.