media: vim2m: remove unused CLIP macro

The CLIP macro, which was used to clamp color component values to the
[0, 255] range, is no longer used anywhere in the vim2m driver. Remove it
to clean up the code and avoid confusion.

The following issues were reported by checkpatch:
ERROR: Macros with complex values should be enclosed in parentheses

Signed-off-by: Yunseong Kim <ysk@kzalloc.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

drivers/media/test-drivers/vim2m.c

@@ -266,9 +266,6 @@ static const char *type_name(enum v4l2_buf_type type)
 	}
 }
 
-#define CLIP(__color) \
-	(u8)(((__color) > 0xff) ? 0xff : (((__color) < 0) ? 0 : (__color)))
-
 static void copy_line(struct vim2m_q_data *q_data_out,
 		      u8 *src, u8 *dst, bool reverse)
 {