[RFC PATCH] compiler warning on 32-bit

The sg_io_v4 interface passes pointers as u64s.  It turns out GCC
disapproves of us casting a u64 straight to a 32 bit pointer.

cc1: warnings being treated as errors
scsi_serial.c: In function ‘sg_err_category4’:
scsi_serial.c:159: warning: cast to pointer from integer of different size
scsi_serial.c: In function ‘scsi_dump_v4’:
scsi_serial.c:303: warning: cast to pointer from integer of different size

We could either suppress this with -Wno-int-to-pointer-cast or work around it.

diff --git a/extras/scsi_id/scsi_serial.c b/extras/scsi_id/scsi_serial.c
index 757f41d..20d30cf 100644
--- a/extras/scsi_id/scsi_serial.c
+++ b/extras/scsi_id/scsi_serial.c
@@ -156,7 +156,7 @@ static int sg_err_category4(struct udev *udev, struct sg_io_v4 *hp)
 {
 	return sg_err_category_new(udev, hp->device_status, 0,
 				   hp->transport_status, hp->driver_status,
-				   (unsigned char *)hp->response,
+				   (unsigned char *)(uintptr_t)hp->response,
 				   hp->response_len);
 }

@@ -300,7 +300,7 @@ static int scsi_dump_v4(struct udev *udev,
 	    dev_scsi->kernel, io->driver_status, io->transport_status,
 	     io->device_status);
 	if (io->device_status == SCSI_CHECK_CONDITION)
-		return scsi_dump_sense(udev, dev_scsi, (unsigned char *)io->response,
+		return scsi_dump_sense(udev, dev_scsi, (unsigned char *)(uintptr_t)io->response,