Don't allow a wheel emulation inertia of 0 (#66125)

Inertia of 0 results in an infinite loop of events being sent to the server.

X.Org Bug 66125 <http://bugs.freedesktop.org/show_bug.cgi?id=66125>

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

src/emuWheel.c

@@ -392,7 +392,7 @@ EvdevWheelEmuSetProperty(DeviceIntPtr dev, Atom atom, XIPropertyValuePtr val,
 
         inertia = *((CARD16*)val->data);
 
-        if (inertia < 0)
+        if (inertia <= 0)
             return BadValue;
 
         if (!checkonly)