Silence new gcc warnings on switch statement fallthroughs

Reword the comments to make gcc 8.1 recognize these as designed cases
and not trigger implicit-fallthrough warnings.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

src/eap_server/eap_server_fast.c

@@ -1516,7 +1516,7 @@ static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
 		if (eap_fast_process_phase1(sm, data))
 			break;
 
-		/* fall through to PHASE2_START */
+		/* fall through */
 	case PHASE2_START:
 		eap_fast_process_phase2_start(sm, data);
 		break;

src/eap_server/eap_server_ikev2.c

@@ -223,7 +223,7 @@ static struct wpabuf * eap_ikev2_buildReq(struct eap_sm *sm, void *priv, u8 id)
 			}
 			data->out_used = 0;
 		}
-		/* pass through */
+		/* fall through */
 	case WAIT_FRAG_ACK:
 		return eap_ikev2_build_msg(data, id);
 	case FRAG_ACK:

src/eap_server/eap_server_wsc.c

@@ -257,7 +257,7 @@ static struct wpabuf * eap_wsc_buildReq(struct eap_sm *sm, void *priv, u8 id)
 			}
 			data->out_used = 0;
 		}
-		/* pass through */
+		/* fall through */
 	case WAIT_FRAG_ACK:
 		return eap_wsc_build_msg(data, id);
 	case FRAG_ACK:

src/fst/fst_ctrl_iface.c

@@ -49,7 +49,7 @@ static Boolean format_session_state_extra(const union fst_event_extra *extra,
 		if (ss->extra.to_initial.reject_code != WLAN_STATUS_SUCCESS)
 			os_snprintf(reject_str, sizeof(reject_str), "%u",
 				    ss->extra.to_initial.reject_code);
-		/* no break */
+		/* fall through */
 	case REASON_TEARDOWN:
 	case REASON_SWITCH:
 		switch (ss->extra.to_initial.initiator) {

src/radius/radius_client.c

@@ -904,13 +904,13 @@ static void radius_client_receive(int sock, void *eloop_ctx, void *sock_ctx)
 		switch (res) {
 		case RADIUS_RX_PROCESSED:
 			radius_msg_free(msg);
-			/* continue */
+			/* fall through */
 		case RADIUS_RX_QUEUED:
 			radius_client_msg_free(req);
 			return;
 		case RADIUS_RX_INVALID_AUTHENTICATOR:
 			invalid_authenticator++;
-			/* continue */
+			/* fall through */
 		case RADIUS_RX_UNKNOWN:
 			/* continue with next handler */
 			break;

wpa_supplicant/mesh_mpm.c

@@ -437,7 +437,7 @@ static void plink_timer(void *eloop_ctx, void *user_data)
 			break;
 		}
 		reason = WLAN_REASON_MESH_MAX_RETRIES;
-		/* fall through on else */
+		/* fall through */
 
 	case PLINK_CNF_RCVD:
 		/* confirm timer */