cifs: make cifs_chan_update_iface() a void function

cifs: make cifs_chan_update_iface() a void function

[ Upstream commit 8d606c311b75e81063b4ea650b301cbe0c4ed5e1 ]

The return values for cifs_chan_update_iface() didn't match what the
documentation said and nothing was checking them anyway.  Just make it
a void function.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Stable-dep-of: 16a57d768111 ("cifs: reduce warning log level for server not advertising interfaces")
Signed-off-by: Sasha Levin <sashal@kernel.org>