xkb: don't update LEDs if they don't exist. (Bug #13961)
In some weird cases we call this function when there is no SrvLedInfo on the device. And it turns out null-pointer dereferences are bad. X.Org Bug 13961 <http://bugs.freedesktop.org/show_bug.cgi?id=13961>
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@ -63,6 +63,9 @@ XkbSrvLedInfoPtr sli;
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sli= XkbFindSrvLedInfo(dev,XkbDfltXIClass,XkbDfltXIId,0);
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if (!sli)
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return update;
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if (state_changes&(XkbModifierStateMask|XkbGroupStateMask))
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update|= sli->usesEffective;
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if (state_changes&(XkbModifierBaseMask|XkbGroupBaseMask))
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