quell compiler warnings for -Wimplicit-fallthrough

src/connections.c

@@ -1150,6 +1150,7 @@ int connection_state_machine(server *srv, connection *con) {
 					break; /* come back here */
 				}
 				/* response headers received from backend; fall through to start response */
+				/* fall through */
 			case HANDLER_FINISHED:
 				if (con->error_handler_saved_status > 0) {
 					con->request.http_method = con->error_handler_saved_method;

src/mod_openssl.c

@@ -1317,6 +1317,7 @@ connection_read_cq_ssl (server *srv, connection *con,
         switch ((r = SSL_get_error(hctx->ssl, len))) {
         case SSL_ERROR_WANT_WRITE:
             con->is_writable = -1;
+            /* fall through */
         case SSL_ERROR_WANT_READ:
             con->is_readable = 0;
 

src/mod_rewrite.c

@@ -464,6 +464,7 @@ URIHANDLER_FUNC(mod_rewrite_physical) {
 	switch(r = process_rewrite_rules(srv, con, p, p->conf.rewrite_NF)) {
 	case HANDLER_COMEBACK:
 		buffer_reset(con->physical.path);
+		/* fall through */
 	default:
 		return r;
 	}