hwrng: bcm2835 - Add missing clk_disable_unprepare in bcm2835_rng_init

BugLink: https://bugs.launchpad.net/bugs/2089340

commit d57e2f7cffd57fe2800332dec768ec1b67a4159f upstream.

Add the missing clk_disable_unprepare() before return in
bcm2835_rng_init().

Fixes: e5f9f41d5e ("hwrng: bcm2835 - add reset support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

drivers/char/hw_random/bcm2835-rng.c

@@ -94,8 +94,10 @@ static int bcm2835_rng_init(struct hwrng *rng)
 		return ret;
 
 	ret = reset_control_reset(priv->reset);
-	if (ret)
+	if (ret) {
+		clk_disable_unprepare(priv->clk);
 		return ret;
+	}
 
 	if (priv->mask_interrupts) {
 		/* mask the interrupt */