Don't cast second argument of mem_printf_hook (%b) to size_t.

Also treat the given number as unsigned int.

Due to the printf hook registration the second argument of
mem_printf_hook (if called via printf etc.) is always of type int*.
Casting this to a size_t pointer and then dereferencing that as int does
not work on big endian machines if int is smaller than size_t (e.g. on ppc64).

In order to make this change work if the argument is of a type larger
than int, size_t for instance, the second argument for %b has to be casted
to (u_)int.

src/libcharon/plugins/smp/smp.c

@@ -642,7 +642,7 @@ static job_requeue_t process(int *fdp)
 		DBG2(DBG_CFG, "SMP XML connection closed");
 		return JOB_REQUEUE_NONE;
 	}
-	DBG3(DBG_CFG, "got XML request: %b", buffer, len);
+	DBG3(DBG_CFG, "got XML request: %b", buffer, (u_int)len);
 
 	reader = xmlReaderForMemory(buffer, len, NULL, NULL, 0);
 	if (reader == NULL)