OpenZFS 9035 - zfs: this statement may fall through

Authored by: Toomas Soome <tsoome@me.com>
Reviewed by: Yuri Pankov <yuripv@yuripv.net>
Reviewed by: Andy Fiddaman <omnios@citrus-it.co.uk>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Ported-by: Giuseppe Di Natale <dinatale2@llnl.gov>

OpenZFS-issue: https://www.illumos.org/issues/9035
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/46ac8fdfc5
Closes #7206

module/lua/ltable.c

@@ -492,6 +492,7 @@ const TValue *luaH_get (Table *t, const TValue *key) {
         return luaH_getint(t, k);  /* use specialized version */
       /* else go through */
     }
+    /* FALLTHROUGH */
     default: {
       Node *n = mainposition(t, key);
       do {  /* check whether `key' is somewhere in the chain */