Bug fix reported on squirrel forum

SquiLu/squirrel/sqcompiler.cpp

@@ -529,7 +529,9 @@ public:
                 SQInteger tmp = _fs->PushTarget();
                 _fs->AddInstruction(_OP_GETOUTER,   tmp, pos);
                 _fs->AddInstruction(ChooseArithOpByToken(tok), tmp, val, tmp, 0);
-                _fs->AddInstruction(_OP_SETOUTER, tmp, pos, tmp);
+                _fs->PopTarget();
+                _fs->PopTarget();
+                _fs->AddInstruction(_OP_SETOUTER, _fs->PushTarget(), pos, tmp);
             }
             break;
         }