i2c: bail out early when RDWR parameters are wrong
The buggy parameters currently get caught later, but emit a noisy WARN. Userspace should not be able to trigger this, so add similar checks much earlier. Also avoids some unneeded code paths, of course. Apply kernel coding stlye to a comment while here. Reported-by: <syzbot+ffb0b3ffa6cfbc7d7b3f@syzkaller.appspotmail.com> Tested-by: <syzbot+ffb0b3ffa6cfbc7d7b3f@syzkaller.appspotmail.com> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
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