#1 checksum errors

[Michael Jarvis]

When using the driver with a USB webcam, there are a
lot of checksum errors.

Here are sample errors:

Jan 30 13:53:57 goblin kernel: cpia2: checksum
mismatch (j==636): [9] len=638, calculated = 3f24
(16164), checksum = 45c9 (17865)
Jan 30 13:54:20 goblin kernel: cpia2: checksum
mismatch (j==636): [5] len=638, calculated = 3893
(14483), checksum = ea3b (59963)
Jan 30 13:54:40 goblin kernel: cpia2: checksum
mismatch (j==636): [4] len=638, calculated = 3371
(13169), checksum = 1ac2 (6850)
Jan 30 13:54:50 goblin kernel: cpia2: checksum
mismatch (j==636): [0] len=638, calculated = 30c4
(12484), checksum = 1352 (4946)
Jan 30 13:55:00 goblin kernel: cpia2: checksum
mismatch (j==636): [4] len=638, calculated = 38b5
(14517), checksum = 8ca1 (36001)
Jan 30 13:55:26 goblin kernel: cpia2: checksum
mismatch (j==636): [9] len=638, calculated = 396d
(14701), checksum = ad69 (44393)
Jan 30 13:55:30 goblin kernel: cpia2: checksum
mismatch (j==636): [0] len=638, calculated = 3623
(13859), checksum = b837 (47159)
Jan 30 13:55:49 goblin kernel: cpia2: checksum
mismatch (j==636): [4] len=638, calculated = 3519
(13593), checksum = d9ff (55807)
Jan 30 13:55:55 goblin kernel: cpia2: checksum
mismatch (j==636): [8] len=638, calculated = 2517
(9495), checksum = 2f95 (12181)
Jan 30 13:56:15 goblin kernel: cpia2: checksum
mismatch (j==636): [2] len=638, calculated = 3200
(12800), checksum = d9ff (55807)
Jan 30 13:57:00 goblin kernel: cpia2: checksum
mismatch (j==636): [3] len=638, calculated = 301b
(12315), checksum = 2068 (8296)
Jan 30 13:57:13 goblin kernel: cpia2: checksum
mismatch (j==636): [5] len=638, calculated = 3dd8
(15832), checksum = 5945 (22853)