s3: Use -C in smbclient

s3: Use -C in smbclient

$ bin/wbinfo --ccache-save=w2k3ad\\vl%Password
saving creds succeeded
$ bin/smbclient //192.168.42.160/tmp -Uvl -N -C -W w2k3ad
OS=[Windows Server 2003 R2 3790 Service Pack 2] Server=[Windows Server 2003 R2 5.2]
smb: \>
$ bin/wbinfo --ccache-save=w2k3ad\\vl%WrongPassword
saving creds succeeded
$ bin/smbclient //192.168.42.160/tmp -Uvl -N -C -W w2k3ad
Anonymous login successful
Domain=[W2K3AD] OS=[Windows Server 2003 R2 3790 Service Pack 2] Server=[Windows Server 2003 R2 5.2]
tree connect failed: NT_STATUS_ACCESS_DENIED
$
(cherry picked from commit 5e91f9eb10404a1df470fd87fc8c1cae5ea7b70c)