media: usb/msi2500: fix repeated words in comments

Delete the redundant word 'for'.
Signed-off-by: Jilin Yuan <yuanjilin@cdjrlc.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/usb/msi2500/msi2500.c

@@ -209,7 +209,7 @@ static struct msi2500_frame_buf *msi2500_get_next_fill_buf(
  *
  * Control bits for previous samples is 32-bit field, containing 16 x 2-bit
  * numbers. This results one 2-bit number for 8 samples. It is likely used for
- * for bit shifting sample by given bits, increasing actual sampling resolution.
+ * bit shifting sample by given bits, increasing actual sampling resolution.
  * Number 2 (0b10) was never seen.
  *
  * 6 * 16 * 2 * 4 = 768 samples. 768 * 4 = 3072 bytes