media: davinci_vpfe: get rid of an unused var at dm365_isif.c

Not sure what was the original idea here, but the implementation
went into a different way, and the fmt var is not used
anymore, as warned:

drivers/staging/media/davinci_vpfe/dm365_isif.c: In function '__isif_get_format':
drivers/staging/media/davinci_vpfe/dm365_isif.c:1401:29: warning: variable 'fmt' set but not used [-Wunused-but-set-variable]
   struct v4l2_subdev_format fmt;
                             ^~~
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/davinci_vpfe/dm365_isif.c

@@ -1397,14 +1397,9 @@ __isif_get_format(struct vpfe_isif_device *isif,
 		  struct v4l2_subdev_pad_config *cfg, unsigned int pad,
 		  enum v4l2_subdev_format_whence which)
 {
-	if (which == V4L2_SUBDEV_FORMAT_TRY) {
-		struct v4l2_subdev_format fmt;
-
-		fmt.pad = pad;
-		fmt.which = which;
-
+	if (which == V4L2_SUBDEV_FORMAT_TRY)
 		return v4l2_subdev_get_try_format(&isif->subdev, cfg, pad);
-	}
+
 	return &isif->formats[pad];
 }