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_nhg.c b/zebra/zebra_nhg.c
index 1879bafcac..6517b7830b 100644
--- a/zebra/zebra_nhg.c
+++ b/zebra/zebra_nhg.c
@@ -1310,6 +1310,7 @@ int nhg_ctx_process(struct nhg_ctx *ctx)
 		break;
 	case NHG_CTX_OP_DEL:
 		ret = nhg_ctx_process_del(ctx);
+		break;
 	case NHG_CTX_OP_NONE:
 		break;
 	}