Linux: fix clear_halt implementation

The ioctl expects an integer.
Bug found with the assistance of Soumen Mondal

libusb/os/linux_usbfs.c

diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c
index 73529dc..820100f 100644
--- a/libusb/os/linux_usbfs.c
+++ b/libusb/os/linux_usbfs.c
@@ -597,7 +597,8 @@
 	unsigned char endpoint)
 {
 	int fd = __device_handle_priv(handle)->fd;
-	int r = ioctl(fd, IOCTL_USBFS_CLEAR_HALT, &endpoint);
+	unsigned int _endpoint = endpoint;
+	int r = ioctl(fd, IOCTL_USBFS_CLEAR_HALT, &_endpoint);
 	if (r) {
 		if (errno == ENOENT)
 			return LIBUSB_ERROR_NOT_FOUND;