PCI: xilinx: Check for __get_free_pages() failure
If __get_free_pages() fails, return -ENOMEM to avoid a NULL pointer dereference. Signed-off-by: Kangjie Lu <kjlu@umn.edu> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Steven Price <steven.price@arm.com> Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
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