"ret_val" is supposed to be signed here or the error handling breaks.
Also we should check the return value from i2c_smbus_read_byte_data().
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>