platform/chrome: cros_ec_lpc: Fix error code in cros_ec_lpc_mec_read_bytes()

We changed these functions to returning negative error codes, but this
first error path was accidentally overlooked. It leads to a Smatch
warning:

drivers/platform/chrome/cros_ec_lpc.c:181 ec_response_timed_out()
error: uninitialized symbol 'data'.

Fix this by returning the error code instead of success.

Fixes: 68dbac0a58ef ("platform/chrome: cros_ec_lpc: MEC access can return error code")
Signed-off-by: Dan Carpenter <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Tzung-Bi Shih <[e-mail]>

drivers/platform/chrome/cros_ec_lpc.c

···
 	int in_range = cros_ec_lpc_mec_in_range(offset, length);
 
 	if (in_range < 0)
-		return 0;
+		return in_range;
 
 	return in_range ?
 		cros_ec_lpc_io_bytes_mec(MEC_IO_READ,
···
 	int in_range = cros_ec_lpc_mec_in_range(offset, length);
 
 	if (in_range < 0)
-		return 0;
+		return in_range;
 
 	return in_range ?
 		cros_ec_lpc_io_bytes_mec(MEC_IO_WRITE,