There are rare cases when xf86SetDepthBpp is resizing displays array in confScreen.
As that array is shared between set of ScrnInfoRec's then realloc might invalidate chached DispPtr display values in
otheres ScrnInfoRec objects.
If we will change displays array as an array of pointers to DispRec then cached DispRec pointers in ScrnInfoRec
won't be invalid after reallocation of displays array.
Signed-off-by: Łukasz Spintzyk <lukasz.spintzyk@synaptics.com>
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