syndaemon: don't compare against a null-property. (#37459)
syndaemon: don't compare against a null-property. (#37459)

synaptics_property is not set, touchpad_off_prop is the property we need to
check against.

False check for (nprops != 0) instead of (nprops < 0) would result in
syndaemon always reporting a touchpad device, even if none are present.

X.Org Bug 37459 <http://bugs.freedesktop.org/show_bug.cgi?id=37459>

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

jiixyj/xf86-input-synaptics,gdestuynder/xf86-input-synaptics,jiixyj/xf86-input-synaptics,sencer/synaptics,mortehu/xf86-input-synaptics,felipejfc/xserver-xorg-input-synaptics,ssaavedra/xf86-input-synaptics,corcoran/xserver-xorg-input-synaptics,eyko/xf86-input-synaptics,philipn/xserver-xorg-input-synaptics,eyko/xf86-input-synaptics,sencer/synaptics,nanderson94/xf86-input-synaptics,quadpixels/three-finger-dragging,mmonaco/xf86-input-synaptics,philipn/xserver-xorg-input-synaptics,kelnos/xf86-input-synaptics,Lyude/xf86-input-synaptics,Lyude/xf86-input-synaptics,gdestuynder/xf86-input-synaptics,mmonaco/xf86-input-synaptics,corcoran/xserver-xorg-input-synaptics,quadpixels/three-finger-dragging,felipejfc/xserver-xorg-input-synaptics,mortehu/xf86-input-synaptics,nanderson94/xf86-input-synaptics,ssaavedra/xf86-input-synaptics,philipn/xserver-xorg-input-synaptics,RsrchBoy/xserver-xorg-input-synaptics,RsrchBoy/xserver-xorg-input-synaptics,felipejfc/xserver-xorg-input-synaptics,kelnos/xf86-input-synaptics