[Bug 222255] RPI random number generator breaks kernel build when BCM2835_RNG_USE_CALLOUT is set

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222255

            Bug ID: 222255
           Summary: RPI random number generator breaks kernel build when
                    BCM2835_RNG_USE_CALLOUT is set
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: sylvain at sylvaingarrigues.com

/usr/src/sys/arm/broadcom/bcm2835/bcm2835_rng.c:323:2: error: incompatible
pointer types passing 'void (struct bcm2835_rng_softc *)' to parameter of type
'void (*)(void *)' [-Werror,-Wincompatible-pointer-types]                     
                   ^               
/usr/src/sys/arm/broadcom/bcm2835/bcm2835_rng.c:476:2: error: incompatible
pointer types passing 'void (struct bcm2835_rng_softc *)' to parameter of type
'void (*)(void *)' [-Werror,-Wincompatible-pointer-types]


Things work when we use a cast:
callout_reset(&sc->sc_rngto, sc->sc_rnghz, bcm2835_rng_harvest, sc);
==>
callout_reset(&sc->sc_rngto, sc->sc_rnghz, (void (*)(void
*))bcm2835_rng_harvest, sc);

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