UPSTREAM: usb: typec: mux: Fix unsigned comparison with less than zero

The return from the call to fwnode_property_read_u16_array is int,
it can be a negative error code however this is being assigned to
an size_t variable 'nval', hence the check is always false.
Fix this by making 'nval' an int.

Detected by Coccinelle ("Unsigned expression compared with
zero: nval < 0")

Bug: 150877929
Fixes: 96a6d031ca99 ("usb: typec: mux: Find the muxes by also matching against the device node")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: I3169e47b59bbe5972b79ce88f849b345a401898e
(cherry picked from commit 4e46f271c37415323f2b650d02ef50c87ff8d092)
Signed-off-by: Will McVicker <willmcvicker@google.com>