scsi: scsi_transport_srp: Replace min/max nesting with clamp()

scsi: scsi_transport_srp: Replace min/max nesting with clamp()

This patch replaces min(a, max(b, c)) by clamp(val, lo, hi) in the SRP
transport layer. The clamp() macro explicitly expresses the intent of
constraining a value within bounds, improving code readability.

Signed-off-by: Li Haoran <li.haoran7@zte.com.cn>
Signed-off-by: Shao Mingyin <shao.mingyin@zte.com.cn>
Link: https://lore.kernel.org/r/202503311555115618U8Md16mKpRYOIy2TOmB6@zte.com.cn
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>