tcp: Use clamp() in htcp_alpha_update()

Using clamp instead of min(max()) is easier to read and it matches even
better the comment just above it.

It also reduces the size of the preprocessed files by ~ 2.5 ko.
(see [1] for a discussion about it)

$ ls -l net/ipv4/tcp_htcp*.i
5576024 27 juil. 10:19 net/ipv4/tcp_htcp.old.i
5573550 27 juil. 10:21 net/ipv4/tcp_htcp.new.i

[1]: https://lore.kernel.org/all/[e-mail]/

Signed-off-by: Christophe JAILLET <[e-mail]>
Reviewed-by: Eric Dumazet <[e-mail]>
Link: https://patch.msgid.link/561bb49744[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/ipv4/tcp_htcp.c

···
 		u32 scale = (HZ << 3) / (10 * minRTT);
 
 		/* clamping ratio to interval [0.5,10]<<3 */
-		scale = min(max(scale, 1U << 2), 10U << 3);
+		scale = clamp(scale, 1U << 2, 10U << 3);
 		factor = (factor << 3) / scale;
 		if (!factor)
 			factor = 1;