stmmac: merge get_rx_owner into rx_status routine.
The RDES0 register can be read several times while doing RX of a packet. This patch slightly improves RX path performance by reading rdes0 once for two operation: check rx owner, get rx status bits. Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com> Acked-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: NAlexandre TORGUE <alexandre.torgue@st.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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