IB/iser: Fix redundant pointer check in dealloc flow
This bug was discovered by Smatch static checker run by Dan Carpenter. If in free_rx_descriptors(), rx_descs are not NULL then the iser device is definately not NULL, so no need to check it before dereferencing it. Signed-off-by: NSagi Grimberg <sagig@mellanox.com> Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com> Signed-off-by: NRoland Dreier <roland@purestorage.com>
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