hwrng: ba431 - fix reported byte count

Use the size of the buffer element instead of the pointer size to report
the number of bytes read. Since data is a u32 pointer and sizeof(data)
is 8 bytes on 64-bit systems, using the pointer size reports twice the
number of bytes actually read.

Fixes: 0289e9be5d ("hwrng: ba431 - add support for BA431 hwrng")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <blum@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/ba431-rng.c

@@ -147,7 +147,7 @@ static int ba431_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 		}
 	}
 
-	n *= sizeof(data);
+	n *= sizeof(*data);
 	return (n || !wait) ? n : -EIO;
 }