evdev: Initialize valuators array. (#24737)

The array needs to be filled with zeros, otherwise we may end up sending
it with random values if non-zero values aren't in one row (which is the
case for A4Tech X-750F which sends REL_MISC events without a reason).

X.Org Bug 24737 <http://bugs.freedesktop.org/show_bug.cgi?id=24737>

Signed-off-by: Bartosz Brachaczek <b.brachaczek@gmail.com>
Tested-by: Bartek Iwaniec <hash87@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

src/evdev.c

@@ -661,7 +661,7 @@ static void
 EvdevProcessSyncEvent(InputInfoPtr pInfo, struct input_event *ev)
 {
     int num_v = 0, first_v = 0;
-    int v[MAX_VALUATORS];
+    int v[MAX_VALUATORS] = {};
     EvdevPtr pEvdev = pInfo->private;
 
     EvdevProcessValuators(pInfo, v, &num_v, &first_v);