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, 0 deletions

diff --git a/zebra/zebra_mpls.c b/zebra/zebra_mpls.c
index eac4fcc8e0..c2e34faed6 100644
--- a/zebra/zebra_mpls.c
+++ b/zebra/zebra_mpls.c
@@ -1182,6 +1182,7 @@ static char *nhlfe2str(const struct zebra_nhlfe *nhlfe, char *buf, int size)
 		break;
 	case NEXTHOP_TYPE_IFINDEX:
 		snprintf(buf, size, "Ifindex: %u", nexthop->ifindex);
+		break;
 	case NEXTHOP_TYPE_BLACKHOLE:
 		break;
 	}