sfc: replace min/max nesting with clamp()

The clamp() macro explicitly expresses the intent of constraining
a value within bounds.Therefore, replacing min(max(a, b), c) with
clamp(val, lo, hi) can improve code readability.

Signed-off-by: Xichao Zhao <[e-mail]>
Reviewed-by: Joe Damato <[e-mail]>
Reviewed-by: Edward Cree <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/sfc/efx_channels.c

···
 
 	if (efx_separate_tx_channels) {
 		efx->n_tx_channels =
-			min(max(n_channels / 2, 1U),
-			    efx->max_tx_channels);
+			clamp(n_channels / 2, 1U,
+			      efx->max_tx_channels);
 		efx->tx_channel_offset =
 			n_channels - efx->n_tx_channels;
 		efx->n_rx_channels =

drivers/net/ethernet/sfc/falcon/efx.c

···
 			if (n_channels > extra_channels)
 				n_channels -= extra_channels;
 			if (ef4_separate_tx_channels) {
-				efx->n_tx_channels = min(max(n_channels / 2,
-							     1U),
-							 efx->max_tx_channels);
+				efx->n_tx_channels = clamp(n_channels / 2, 1U,
+							   efx->max_tx_channels);
 				efx->n_rx_channels = max(n_channels -
 							 efx->n_tx_channels,
 							 1U);

drivers/net/ethernet/sfc/siena/efx_channels.c

···
 
 	if (efx_siena_separate_tx_channels) {
 		efx->n_tx_channels =
-			min(max(n_channels / 2, 1U),
-			    efx->max_tx_channels);
+			clamp(n_channels / 2, 1U,
+			      efx->max_tx_channels);
 		efx->tx_channel_offset =
 			n_channels - efx->n_tx_channels;
 		efx->n_rx_channels =