[SCSI] scsi_debug: Fix incorrect page length in logical block provisioning VPD

The page length for the 0xb2 VPD page is defined to be 4 bytes when no
provisioning descriptors are provided (DP=0).

Signed-off-by: Martin K. Petersen <[e-mail]>
Acked-by: Douglas Gilbert <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/scsi_debug.c

···
 /* Logical block provisioning VPD page (SBC-3) */
 static int inquiry_evpd_b2(unsigned char *arr)
 {
-	memset(arr, 0, 0x8);
+	memset(arr, 0, 0x4);
 	arr[0] = 0;			/* threshold exponent */
 
 	if (scsi_debug_lbpu)
···
 	if (scsi_debug_lbprz)
 		arr[1] |= 1 << 2;
 
-	return 0x8;
+	return 0x4;
 }
 
 #define SDEBUG_LONG_INQ_SZ 96