net: stmmac: Add missing call to dev_kfree_skb()
When RX HW timestamp is enabled and a frame is discarded we are
not freeing the skb but instead only setting to NULL the entry.
Add a call to dev_kfree_skb_any() so that skb entry is correctly
freed.
Signed-off-by: Jose Abreu <joabreu at synopsys.com>
Cc: David S. Miller <davem at davemloft.net>
Cc: Joao Pinto <jpinto at synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro at st.com>
Cc: Alexandre Torgue <alexandre.torgue at st.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
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