vfio/pci: clean up a type in vfio_pci_ioctl_pci_hot_reset_groups()

The "array_count" value comes from the copy_from_user() in
vfio_pci_ioctl_pci_hot_reset().  If the user passes a value larger than
INT_MAX then we'll pass a negative value to kcalloc() which triggers an
allocation failure and a stack trace.

It's better to make the type unsigned so that if (array_count > count)
returns -EINVAL instead.
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/262ada03-d848-4369-9c37-81edeeed2da2@stanley.mountainSigned-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/pci/vfio_pci_core.c

@@ -1323,7 +1323,7 @@ static int vfio_pci_ioctl_get_pci_hot_reset_info(
 
 static int
 vfio_pci_ioctl_pci_hot_reset_groups(struct vfio_pci_core_device *vdev,
-				    int array_count, bool slot,
+				    u32 array_count, bool slot,
 				    struct vfio_pci_hot_reset __user *arg)
 {
 	int32_t *group_fds;