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[http] Notify data transfer interface when underlying connection is r…
…eady HTTP implements xfer_window_changed() on the underlying server connection using http_step(), which does not propagate the window change notification to the data transfer interface. This breaks the multipath-capable SAN boot code, which relies on the window change notification to discover that the HTTP block device is ready for commands to be issued. Fix by sending xfer_window_changed() in http_step() once the underlying connection has been determined to be ready. Signed-off-by: Michael Brown <mcb30@ipxe.org>