Not checking properly the return value of SuspendThread on Windows

SuspendThread returns a DWORD value, so checking the return value with ">= 0"
doesn't work.  On failure, the return value is (DWORD) -1 (which is
0xFFFFFFFF).

  DWORD last_suspend_count = -1;
  ...
  last_suspend_count = SuspendThread(child_thread_handle);
  if (last_suspend_count >= 0) {
    ...
  }

[ivanpe.google]

SuspendThread returns a DWORD value, so checking the return value with ">= 0"
doesn't work.  On failure, the return value is (DWORD) -1 (which is 0xFFFFFFFF).

  DWORD last_suspend_count = -1;
  ...
  last_suspend_count = SuspendThread(child_thread_handle);
  if (last_suspend_count >= 0) {
    ...
  }

[Ivan Penkov]

.

[SiyangXie]

LGTM