Bogus usage of tsleep(9) in USB.

Hi.

There are many calls to tsleep(9) with no timeout in our USB code.
As you all know, it is not permitted and we have KASSERT() for this:

        KASSERT(timo != 0 || mtx_owned(&Giant) || mtx != NULL,
            ("sleeping without a mutex"));

ehci.c:2441:    tsleep(&sc->sc_softwake, PZERO, "ehciab", 0);
ohci.c:2288:    tsleep(&sc->sc_softwake, PZERO, "ohciab", 0);
ubser.c:882:            tsleep(&sc->sc_opening, PRIBIO, "ubser_op", 0);
ucom.c:275:             tsleep(&sc->sc_opening, PRIBIO, "ucomop", 0);
ugen.c:633:                     error = tsleep(sce, PZERO | PCATCH, "ugenri", 0);
ugen.c:697:                     error = tsleep(sce, PZERO | PCATCH, "ugenri", 0);
uhci.c:1982:    tsleep(&sc->sc_softwake, PZERO, "uhciab", 0);
uhid.c:496:             error = tsleep(&sc->sc_q, PZERO | PCATCH, "uhidrea", 0);
ums.c:639:              error = tsleep(sc, PZERO | PCATCH, "umsrea", 0);
usb.c:456:                      tsleep(&usb_all_tasks, PWAIT, "usbtsk", 0);
usb.c:534:              error = tsleep(&usb_events, PZERO | PCATCH, "usbrea", 0);
usbdi.c:342:            tsleep(xfer, PRIBIO, "usbsyn", 0);
usbdi_util.c:435:       error = tsleep(xfer, PZERO | PCATCH, lbl, 0);
usbdi_util.c:477:       error = tsleep(xfer, PZERO | PCATCH, lbl, 0);

I saw only panic on tsleep(9) from usbdi.c, so I know for sure we don't
hold Giant there.

-- 
Pawel Jakub Dawidek                       http://www.FreeBSD.org
pjd_at_FreeBSD.org                           http://garage.freebsd.pl
FreeBSD committer                         Am I Evil? Yes, I Am!