fix fallthrough warnings

In lib/utils.c comment for fallthrough was in wrong place
and one was missing in xfrm_state.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

ip/xfrm_state.c

@@ -660,6 +660,7 @@ static int xfrm_state_modify(int cmd, unsigned int flags, int argc, char **argv)
 		case XFRM_MODE_BEET:
 			if (req.xsinfo.id.proto == IPPROTO_ESP)
 				break;
+			/* fallthrough */
 		default:
 			fprintf(stderr, "MODE value is invalid with XFRM-PROTO value \"%s\"\n",
 				strxf_xfrmproto(req.xsinfo.id.proto));

lib/utils.c

@@ -985,9 +985,8 @@ const char *rt_addr_n2a_r(int af, int len,
 			return inet_ntop(AF_INET6, &sa->sin6.sin6_addr,
 					 buf, buflen);
 		}
-
-		/* fallthrough */
 	}
+		/* fallthrough */
 	default:
 		return "???";
 	}