qrtr: Convert qrtr_ports from IDR to XArray
The XArray interface is easier for this driver to use. Also fixes a bug reported by the improper use of GFP_ATOMIC. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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