cifs: remove redundant return in cifs_creation_time_get

There is a redundant return in function cifs_creation_time_get
that appears to be old vestigial code than can be removed. So
remove it.

Detected by CoverityScan, CID#1361924 ("Structurally dead code")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steve French <smfrench@gmail.com>