[media] cxusb: unlock on error in cxusb_i2c_xfer()
[media] cxusb: unlock on error in cxusb_i2c_xfer()

We recently introduced some new error paths which are missing their
unlocks.
Fixes: 64f7ef8afbf8 ('[media] cxusb: Don't use dynamic static allocation')

Signed-off-by: Dan Carpenter <ff341aa343d564f9e53e9dcb6996be8c04859a66@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <0cae1d1e981e84d16b82ca3d17be8a7f826608d3@samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs