Fix "display the output of quilt push/pop".
Fix "display the output of quilt push/pop".

Fix commit 16d97b30b91da02d5a3edc2b895cbd4a1995f62d to check the
return value of quilt, not the one of tee.

philipn/xserver-xorg-input-synaptics,facboy/xserver-xorg-video-qxl,RsrchBoy/xserver-xorg-input-synaptics,facboy/xserver-xorg-video-qxl,facboy/xserver-xorg-video-qxl,RsrchBoy/xserver-xorg-input-synaptics,philipn/xserver-xorg-input-synaptics,facboy/xserver-xorg-video-qxl,philipn/xserver-xorg-input-synaptics