media: ipu3: drop an unused variable

Fix this clang Werror with W=1:

	drivers/staging/media/ipu3/ipu3-css-params.c:774:8: error: variable 'pin_scale' set but not used [-Werror,-Wunused-but-set-variable]
	                        int pin_scale = 0;
	                            ^
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/ipu3/ipu3-css-params.c

@@ -771,7 +771,6 @@ static int imgu_css_osys_calc_frame_and_stripe_params(
 		 */
 		{
 			unsigned int i;
-			int pin_scale = 0;
 			/*Input resolution */
 
 			stripe_params[s].input_width = stripe_input_width_y;
@@ -791,8 +790,6 @@ static int imgu_css_osys_calc_frame_and_stripe_params(
 						reso.pin_height[i];
 					stripe_params[s].output_offset[i] =
 						stripe_offset_out_y;
-
-					pin_scale += frame_params[i].scaled;
 				} else {
 					/* Unscaled pin */
 					stripe_params[s].output_width[i] =