cifsd: Remove smb2_put_name()

smb2_put_name() is called twice, and both call sites do the IS_ERR() check
before.

Signed-off-by: Marios Makassikis <mmakassikis@freebox.fr>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>