net: dm9000: Correctly handle empty FIFO
Assign packet pointer only in case the MAC reports anything in the FIFO. In case the MAC indicates empty FIFO, return 0 to pass that information to the network stack. Signed-off-by:Marek Vasut <marex@denx.de> Cc: Joe Hershberger <joe.hershberger@ni.com> Cc: Ramon Fried <rfried.dev@gmail.com> Reviewed-by:
Ramon Fried <rfried.dev@gmail.com>
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