xfree86: Fix out of array bound access to xf86Entities

Signed-off-by: Łukasz Spintzyk <lukasz.spintzyk@synaptics.com>
5 jobs for master in 9 minutes and 33 seconds (queued for 7 seconds)
Status Name Job ID Coverage
  Docker Image
passed debian-buster #11244525

00:00:37

 
  Build And Test
passed autotools #11244526

00:08:55

passed meson #11244527

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passed meson-noglamor #11244528

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passed mingw-cross-build #11244529

00:01:06