Replace some "fall through" comments not at the end of a case.

src/core/proto/proto_socks.c

@@ -1067,7 +1067,10 @@ parse_socks_client(const uint8_t *data, size_t datalen,
           log_info(LD_NET, "SOCKS 5 client: need authentication.");
           *drain_out = -1;
           return 2;
-        /* fall through */
+        default:
+          /* This wasn't supposed to be exhaustive; there are other
+           * authentication methods too. */
+          ;
       }
 
       *reason = tor_strdup("server doesn't support any of our available "

src/feature/relay/dns.c

@@ -546,7 +546,7 @@ send_resolved_cell,(edge_connection_t *conn, uint8_t answer_type,
         break;
       } else {
         answer_type = RESOLVED_TYPE_ERROR;
-        /* fall through. */
+        /* We let this fall through and treat it as an error. */
       }
       /* Falls through. */
     case RESOLVED_TYPE_ERROR_TRANSIENT: