sctp: fix checkpatch errors with indent

fix checkpatch errors below:
ERROR: switch and case should be at the same inden
ERROR: code indent should use tabs where possible
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Wang Weidong <wangweidong1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/output.c

@@ -540,8 +540,7 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 		} else {
 			/* no need to seed pseudo checksum for SCTP */
 			nskb->ip_summed = CHECKSUM_PARTIAL;
-			nskb->csum_start = (skb_transport_header(nskb) -
-			                    nskb->head);
+			nskb->csum_start = skb_transport_header(nskb) - nskb->head;
 			nskb->csum_offset = offsetof(struct sctphdr, checksum);
 		}
 	}

net/sctp/sm_make_chunk.c

@@ -2001,8 +2001,7 @@ static void sctp_process_ext_param(struct sctp_association *asoc,
 	for (i = 0; i < num_ext; i++) {
 		switch (param.ext->chunks[i]) {
 		case SCTP_CID_FWD_TSN:
-			    if (net->sctp.prsctp_enable &&
-				!asoc->peer.prsctp_capable)
+			if (net->sctp.prsctp_enable && !asoc->peer.prsctp_capable)
 				    asoc->peer.prsctp_capable = 1;
 			break;
 		case SCTP_CID_AUTH:

net/sctp/sm_statefuns.c

@@ -3681,8 +3681,7 @@ sctp_disposition_t sctp_sf_do_asconf(struct net *net,
 	asconf_ack->dest = chunk->source;
 	sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(asconf_ack));
 	if (asoc->new_transport) {
-	        sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport,
-                    commands);
+		sctp_sf_heartbeat(ep, asoc, type, asoc->new_transport, commands);
 		((struct sctp_association *)asoc)->new_transport = NULL;
 	}