media: atomisp2: Array underflow in atomisp_enum_input()

The problem here is this code from atomisp_enum_input():

   581          int index = input->index;
   582
   583          if (index >= isp->input_cnt)
   584                  return -EINVAL;
   585
   586          if (!isp->inputs[index].camera)
   587                  return -EINVAL;

"input->index" is a u32 which comes from the ioctl.  We want negative
values of "index" to be counted as -EINVAL but they aren't.  I've fixed
this by changing the type of "isp->input_cnt" to unsigned int.

Fixes: a49d2536 ("staging/atomisp: Add support for the Intel IPU v2")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/atomisp/pci/atomisp2/atomisp_internal.h

@@ -275,7 +275,7 @@ struct atomisp_device {
 	 */
 	struct mutex streamoff_mutex;
 
-	int input_cnt;
+	unsigned int input_cnt;
 	struct atomisp_input_subdev inputs[ATOM_ISP_MAX_INPUTS];
 	struct v4l2_subdev *flash;
 	struct v4l2_subdev *motor;