e1000: remove unused ifp backpointer
The ifp (struct ifnet) backpointer in the e1000 private ifnet data is not used anymore since the iflib transition. Remove it so that developers are not tempted to use it and get a NULL pointer dereference. Reviewed by: markj, kbowling, erj MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D33157
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@ -439,7 +439,6 @@ struct em_rx_queue {
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/* Our softc structure */
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struct e1000_softc {
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struct ifnet *ifp;
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struct e1000_hw hw;
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if_softc_ctx_t shared;
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