ndis(4): adjustments for our random() specific implementation.

- Revert r300377: The implementation claims to return a value
  within the range. [1]
- Adjust the value for the case of a zero seed, whihc according
  to standards should be equivalent to a seed of value 1.

Pointed out by:	cem

sys/compat/ndis/subr_ntoskrnl.c

@@ -3189,13 +3189,15 @@ static int
 rand(void)
 {
 
-	return (random() / 2 + 1);
+	return (random());
 }
 
 static void
 srand(unsigned int seed)
 {
 
+	if (seed == 0)
+		seed = 1;
 	srandom(seed);
 }