build: add -Wimplicit-fallthrough

Also:
- replace all /* fallthrough */ comments with portable fallthrough;
pseudo keyword to accomodate both gcc and clang
- add missing break; statements as required by older versions of gcc
- cleanup some code to remove unnecessary fallthrough

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/vty.c b/lib/vty.c
index ed8b71ed22..ffb7274b90 100644
--- a/lib/vty.c
+++ b/lib/vty.c
@@ -1565,7 +1565,7 @@ static void vty_read(struct event *thread)
 			break;
 		case '\r':
 			vty->escape = VTY_CR;
-			/* fallthru */
+			fallthrough;
 		case '\n':
 			vty_out(vty, "\n");
 			buffer_flush_available(vty->obuf, vty->wfd);