Fixed dangling 'StkId' in 'luaV_finishget'

Bug introduced in 05932567.

lvm.c

@@ -308,8 +308,8 @@ int luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val,
       /* else will try the metamethod */
     }
     if (ttisfunction(tm)) {  /* is metamethod a function? */
-      luaT_callTMres(L, tm, t, key, val);  /* call it */
-      return ttypetag(s2v(val));
+      tag = luaT_callTMres(L, tm, t, key, val);  /* call it */
+      return tag;  /* return tag of the result */
     }
     t = tm;  /* else try to access 'tm[key]' */
     luaV_fastget(t, key, s2v(val), luaH_get, tag);
@@ -606,8 +606,8 @@ int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) {
   if (tm == NULL)  /* no TM? */
     return 0;  /* objects are different */
   else {
-    luaT_callTMres(L, tm, t1, t2, L->top.p);  /* call TM */
-    return !l_isfalse(s2v(L->top.p));
+    int tag = luaT_callTMres(L, tm, t1, t2, L->top.p);  /* call TM */
+    return !tagisfalse(tag);
   }
 }
 
@@ -914,7 +914,7 @@ void luaV_finishOp (lua_State *L) {
 
 /*
 ** Auxiliary function for arithmetic operations over floats and others
-** with two register operands.
+** with two operands.
 */
 #define op_arithf_aux(L,v1,v2,fop) {  \
   lua_Number n1; lua_Number n2;  \