app_lua: proper jump in the exports array

src/modules/app_lua/app_lua_sr.c

@@ -1953,7 +1953,7 @@ void lua_sr_kemi_register_libs(lua_State *L)
 	if(emods_size>1) {
 		for(k=1; k<emods_size; k++) {
 			n++;
-			_sr_crt_KSRMethods += n;
+			_sr_crt_KSRMethods = _sr_KSRMethods + n;
 			snprintf(mname, 128, "KSR.%s", emods[k].kexp[0].mname.s);
 			for(i=0; emods[k].kexp[i].func!=NULL; i++) {
 				LM_DBG("exporting %s.%s(...)\n", mname,