cmd: dfu: Propagate error if dfu gadget fails
On systems without usb gadget dfu core fails which was reported by error but command itself returns pass which breaks any usage in a script. That's why propagate error from run_usb_dnl_gadget(). Fixes: 16297cfb ("usb: new board-specific USB init interface") Signed-off-by:Michal Simek <michal.simek@xilinx.com>
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