Init LEDs to zero before querying the value

This way if the ioctl fails we don't set any unintended LEDs, but really this
patch is more to silence valgrind:

==7129== Conditional jump or move depends on uninitialised value(s)
==7129==    at 0x8DF99A1: GetKbdLeds (lnx_kbd.c:79)
==7129==    by 0x8DF8853: InitKBD (kbd.c:291)

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>

src/lnx_kbd.c

@@ -70,7 +70,7 @@ SetKbdLeds(InputInfoPtr pInfo, int leds)
 static int
 GetKbdLeds(InputInfoPtr pInfo)
 {
-    char real_leds;
+    char real_leds = 0;
     int leds = 0;
 
     ioctl(pInfo->fd, KDGETLED, &real_leds);