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Fix CID 102619 in the Coverity report on Linux. efx_end_loopback() iterates over an array of skb pointers of which some may be null (if efx_begin_loopback() failed). It should not use dev_kfree_skb_irq(), which requires non-null pointers. In practice this is safe because it does not run in interrupt context and therefore always ends up calling dev_kfree_skb(), which does allow null pointers. But we should make that explicit. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>