Button events may be sent with no valuators (e.g. to simply indicate
ButtonPress or ButtonRelease without any coordinates); when this happens
the server would read uninitialized memory.
==9999== Conditional jump or move depends on uninitialised value(s)
==9999== at 0x48E87E8: pixman_f_transform_point (in /usr/lib/libpixman-1.so.0.18.2)
==9999== Uninitialised value was created by a stack allocation
==9999== at 0x37524: GetPointerEvents (getevents.c:1074)
==9999==
==9999== Conditional jump or move depends on uninitialised value(s)
==9999== at 0x496D074: lround (s_lround.c:40)
==9999== by 0x3773B: GetPointerEvents (getevents.c:1048)
==9999== by 0x683BB: xf86PostButtonEventP (xf86Xinput.c:1162)
==9999== by 0x6853B: xf86PostButtonEvent (xf86Xinput.c:1126)
==9999== by 0x5779037: process_state (multitouch.c:321) (xf86-input-mtev)
==9999== by 0x577908F: read_input (multitouch.c:331)) (xf86-input-mtev)
==9999== by 0x66B4F: xf86SigioReadInput (xf86Events.c:298)
==9999== by 0x112697: xf86SIGIO (sigio.c:118)
==9999== by 0x4A12B2F: ??? (sigrestorer.S:51)
==9999== Uninitialised value was created by a stack allocation
==9999== at 0x37524: GetPointerEvents (getevents.c:1074)
Signed-off-by: Oliver McFadden <oliver.mcfadden@nokia.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
188148e1cc