i2c: i2c_use_client() defends against NULL

Defend the i2c refcount calls against NULL pointers, as is important
(and conventional) for such calls.  Note that none of the current
callers of i2c_use_client() use its return value.

[JD: I hate this but apparently all the other subsystems do it so...]

Signed-off-by: David Brownell <[email protected]>
Signed-off-by: Jean Delvare <[email protected]>
1 file changed