net: qede: use return from qede_flow_spec_validate_unused()

When calling qede_flow_spec_validate_unused() then
the return code was only used for a non-zero check,
and then -EOPNOTSUPP was returned.

qede_flow_spec_validate_unused() can currently fail with:
* -EOPNOTSUPP

This patch changes qede_flow_spec_to_rule() to use the
actual return code from qede_flow_spec_validate_unused(),
so it's no longer assumed that all errors are -EOPNOTSUPP.

Only compile tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/qlogic/qede/qede_filter.c

@@ -1979,10 +1979,11 @@ static int qede_flow_spec_to_rule(struct qede_dev *edev,
 	struct ethtool_rx_flow_spec_input input = {};
 	struct ethtool_rx_flow_rule *flow;
 	__be16 proto;
-	int err = 0;
+	int err;
 
-	if (qede_flow_spec_validate_unused(edev, fs))
-		return -EOPNOTSUPP;
+	err = qede_flow_spec_validate_unused(edev, fs);
+	if (err)
+		return err;
 
 	switch ((fs->flow_type & ~FLOW_EXT)) {
 	case TCP_V4_FLOW: