The array size is set using the value returned by arraySizeErrorCheck,
even when an error occurred, so don't leave it uninitialized.

Bug chromium:801648

Change-Id: If2af27c5f61dca2931796f1681dce61ab6a44341
Reviewed-on: https://swiftshader-review.googlesource.com/18368Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>