cifs: delete unnecessary NULL checks in cifs_chan_update_iface()

We return early if "iface" is NULL so there is no need to check here.
Delete those checks.
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/sess.c

@@ -467,16 +467,13 @@ cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
 		kref_put(&old_iface->refcount, release_iface);
 	} else if (!chan_index) {
 		/* special case: update interface for primary channel */
-		if (iface) {
 		cifs_dbg(FYI, "referencing primary channel iface: %pIS\n",
 			 &iface->sockaddr);
 		iface->num_channels++;
 		iface->weight_fulfilled++;
 	}
-	}
 	spin_unlock(&ses->iface_lock);
 
-	if (iface) {
 	spin_lock(&ses->chan_lock);
 	chan_index = cifs_ses_get_chan_index(ses, server);
 	if (chan_index == CIFS_INVAL_CHAN_INDEX) {
@@ -486,7 +483,6 @@ cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
 
 	ses->chans[chan_index].iface = iface;
 	spin_unlock(&ses->chan_lock);
-	}
 
 	return rc;
 }