Fix FALLTHROUGH warning in switch of GCC7

PR-URL: https://github.com/nodejs/http-parser/pull/357
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

http_parser.c

@@ -1760,6 +1760,7 @@ reexecute:
             case 2:
               parser->upgrade = 1;
 
+            /* FALLTHROUGH */
             case 1:
               parser->flags |= F_SKIPBODY;
               break;
@@ -2319,7 +2320,7 @@ http_parser_parse_url(const char *buf, size_t buflen, int is_connect,
       case s_req_server_with_at:
         found_at = 1;
 
-      /* FALLTROUGH */
+      /* FALLTHROUGH */
       case s_req_server:
         uf = UF_HOST;
         break;