scsi: scsi_trace: Use get_unaligned_be24()

This makes the SCSI tracing code slightly easier to read.

Link: https://lore.kernel.org/r/[e-mail]
Fixes: bf8162354233 ("[SCSI] add scsi trace core functions and put trace points")
Cc: Christoph Hellwig <[e-mail]>
Cc: James E.J. Bottomley <[e-mail]>
Cc: Martin K. Petersen <[e-mail]>
Reported-by: Colin Ian King <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Bart Van Assche <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/scsi_trace.c

···
 scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len)
 {
 	const char *ret = trace_seq_buffer_ptr(p);
-	u32 lba = 0, txlen;
+	u32 lba, txlen;
 
-	lba |= ((cdb[1] & 0x1F) << 16);
-	lba |=  (cdb[2] << 8);
-	lba |=   cdb[3];
+	lba = get_unaligned_be24(&cdb[1]) & 0x1fffff;
 	/*
 	 * From SBC-2: a TRANSFER LENGTH field set to zero specifies that 256
 	 * logical blocks shall be read (READ(6)) or written (WRITE(6)).