media: bt819: Reduce amount of F* words in the world

Replace F* word with something less offensive.

[hverkuil: dropped 'Fixes: 1da177e4 ("Linux-2.6.12-rc2")' tag since nothing was broken]
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/bt819.c

@@ -157,7 +157,7 @@ static int bt819_init(struct v4l2_subdev *sd)
 		0x12, 0x04,	/* 0x12 Output Format */
 		0x13, 0x20,	/* 0x13 Vertical Scaling msb 0x00
 					   chroma comb OFF, line drop scaling, interlace scaling
-					   BUG? Why does turning the chroma comb on fuck up color?
+					   BUG? Why does turning the chroma comb on screw up color?
 					   Bug in the bt819 stepping on my board?
 					*/
 		0x14, 0x00,	/* 0x14 Vertical Scaling lsb */