Infinite gamepad rumble on Windows

example.c

// $ cc -nostartfiles example.c
// $ cl example.c /link /subsystem:console kernel32.lib
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <xinput.h>

struct gamepad {
    void  (*XInputEnable)(BOOL);
    DWORD (*XInputSetState)(DWORD, XINPUT_VIBRATION *);
    DWORD (*XInputGetState)(DWORD, XINPUT_STATE *);
    DWORD (*XInputGetKeystroke)(DWORD, DWORD, PXINPUT_KEYSTROKE);
    int enabled;  // per-controller bit flags
};

static struct gamepad loadgamepad(void)
{
    struct gamepad g = {0};
    HINSTANCE h = 0;
    h = h ? h : LoadLibraryA("xinput1_4.dll");
    h = h ? h : LoadLibraryA("xinput1_3.dll");
    h = h ? h : LoadLibraryA("xinput9_1_0.dll");
    if (h) {
        g.XInputEnable = (void *)GetProcAddress(h, "XInputEnable");
        g.XInputSetState = (void *)GetProcAddress(h, "XInputSetState");
        g.XInputGetState = (void *)GetProcAddress(h, "XInputGetState");
        g.XInputGetKeystroke = (void *)GetProcAddress(h, "XInputGetKeystroke");
        if (g.XInputEnable) {
            g.XInputEnable(TRUE);
            for (int i = 0; i < 4; i++) {
                XINPUT_STATE state;
                if (!g.XInputGetState(i, &state)) {
                    g.enabled |= 1 << i;
                }
            }
        }
    }
    return g;
}

int mainCRTStartup(void)
{
    struct gamepad gp = loadgamepad();
    XINPUT_VIBRATION vibration;
    vibration.wLeftMotorSpeed = -1;
    vibration.wRightMotorSpeed = -1;
    for (int i = 0; i < 4; i++) {
        if (gp.enabled & (1<<i)) {
            gp.XInputSetState(i, &vibration);
        }
    }
    Sleep(INFINITE);
}