Revert "switchtec: Fix Spectre v1 vulnerability"

This reverts commit 6c2b323.

Author: wesleywesley

switchtec.c

@@ -25,7 +25,6 @@
 #include <linux/poll.h>
 #include <linux/wait.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
-#include <linux/nospec.h>
 
 #include "version.h"
 MODULE_DESCRIPTION("Microsemi Switchtec(tm) PCIe Management Driver");
@@ -965,8 +964,6 @@ static int ioctl_port_to_pff(struct switchtec_dev *stdev,
 	default:
 		if (p.port > ARRAY_SIZE(pcfg->dsp_pff_inst_id))
 			return -EINVAL;
-		p.port = array_index_nospec(p.port,
-					ARRAY_SIZE(pcfg->dsp_pff_inst_id) + 1);
 		p.pff = ioread32(&pcfg->dsp_pff_inst_id[p.port - 1]);
 		break;
 	}