usb: gadget: u_ether: fix another dereference after null check
dev->port_usb is checked for null pointer previously, so dev->port_usb might be null during no zlp check, fix it by adding null pointer check. Acked-by: NJim Baxter <jim_baxter@mentor.com> Signed-off-by: NHarish Jenny K N <harish_kandiga@mentor.com> Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
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