hwrng: histb - Fix the wrong format specifier

The format specifier of "unsigned int" in sprintf() should be "%u", not
"%d".

Signed-off-by: Zhu Jun <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/char/hw_random/histb-rng.c

···
 	struct histb_rng_priv *priv = dev_get_drvdata(dev);
 	void __iomem *base = priv->base;
 
-	return sprintf(buf, "%d\n", histb_rng_get_depth(base));
+	return sprintf(buf, "%u\n", histb_rng_get_depth(base));
 }
 
 static ssize_t