Possible integer overflow in integer value sent to mod as seed value about mvdsv

[VVD]

after a few hours of uptime this value can overflow.

clang generate always -2147483648 if overflow.
We can use (int)( (unsigned int) (Sys_DoubleTime() * 100000) ).
Testing:

#include <stdio.h>
double Sys_DoubleTime(double d) {
  return d;
}
int main() {
  printf("double = %lf\n", Sys_DoubleTime(40000.) * 100000);
  printf("u = %d\n", (int) (unsigned int) (Sys_DoubleTime(40000.) * 100000) );
  printf("d = %d\n", (int) (Sys_DoubleTime(40000.) * 100000) );
  int i = Sys_DoubleTime(40000.) * 100000;
  printf("i = %d\n", i);
  return 0;
}

double = 4000000000.000000
u = -294967296
d = -2147483648
i = -2147483648