HID: cp2112: Add parameter validation to data length

Syzkaller reported a stack OOB access in cp2112_write_req caused by lack
of parameter validation for the user input in I2C SMBUS ioctl in cp2112
driver

Add the parameter validation for the data->block[0] to be bounded by
I2C_SMBUS_BLOCK_MAX + the additional compatibility padding

[jkosina@suse.com: fix whitespace damage]
Reported-by:  <syzbot+7617e19c8a59edfbd879@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=7617e19c8a59edfbd879


Tested-by:  <syzbot+7617e19c8a59edfbd879@syzkaller.appspotmail.com>
Signed-off-by: Deepak Sharma <deepak.sharma.472935@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>