Correct misleading indentation.

It is clear that the intention was to run `lua_addvalue()` only if there
is no error because lua_error() “never returns” ←
`load81/lua/doc/manual.html#luaL_error`

Author: AlbertoGP

lua/src/lauxlib.c

@@ -574,7 +574,7 @@ LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
     lf.f = freopen(filename, "rb", lf.f);  /* reopen in binary mode */
     if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
     /* skip eventual `#!...' */
-   while ((c = getc(lf.f)) != EOF && c != LUA_SIGNATURE[0]) ;
+    while ((c = getc(lf.f)) != EOF && c != LUA_SIGNATURE[0]) ;
     lf.extraline = 0;
   }
   ungetc(c, lf.f);
@@ -649,4 +649,3 @@ LUALIB_API lua_State *luaL_newstate (void) {
   if (L) lua_atpanic(L, &panic);
   return L;
 }
-

lua/src/ltablib.c

@@ -135,9 +135,9 @@ static int tremove (lua_State *L) {
 static void addfield (lua_State *L, luaL_Buffer *b, int i) {
   lua_rawgeti(L, 1, i);
   if (!lua_isstring(L, -1))
-    luaL_error(L, "invalid value (%s) at index %d in table for "
-                  LUA_QL("concat"), luaL_typename(L, -1), i);
-    luaL_addvalue(b);
+    return luaL_error(L, "invalid value (%s) at index %d in table for "
+                      LUA_QL("concat"), luaL_typename(L, -1), i);
+  luaL_addvalue(b);
 }
 
 
@@ -284,4 +284,3 @@ LUALIB_API int luaopen_table (lua_State *L) {
   luaL_register(L, LUA_TABLIBNAME, tab_funcs);
   return 1;
 }
-