urngd: Fix more wrong type in format string

Also the other type is worng and causes compile problems on ARM64
platforms.

Fixes: 9b53201d9c ("urngd: Fix wrong type in format string")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 1ae1276eab)

package/system/urngd/patches/001-fix-compile.patch

@@ -5,7 +5,7 @@
  	ret = write_entropy(u, buf, sizeof(buf), ENTROPYBYTES);
  	if (sizeof(buf) != ret) {
 -		ERROR("injected %lub of entropy, less then %db expected\n",
-+		ERROR("injected %zub of entropy, less then %db expected\n",
++		ERROR("injected %zub of entropy, less then %zub expected\n",
  		      ret, sizeof(buf));
  	} else {
  		ret = sizeof(buf);