mpt3sas: Ensure the connector_name string is NUL-terminated

We blindly trust the hardware to give us NUL-terminated strings, which
is a bad idea because it doesn't always do that. For example:

  [  481.184784] mpt3sas_cm0: 	enclosure level(0x0000), connector name(     \x3)

In this case, connector_name is four spaces. We got lucky here because
the 2nd byte beyond our character array happens to be a NUL. Fix this by
explicitly writing '\0' to the end of the string to ensure we don't run
off the edge of the world in printk().

Signed-off-by: Calvin Owens <calvinowens@fb.com>
Acked-by: Chaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/mpt3sas/mpt3sas_base.h

@@ -478,7 +478,7 @@ struct _sas_device {
 	u8	pfa_led_on;
 	u8	pend_sas_rphy_add;
 	u8	enclosure_level;
-	u8	connector_name[4];
+	u8	connector_name[5];
 	struct kref refcount;
 };
 

drivers/scsi/mpt3sas/mpt3sas_scsih.c

@@ -5380,8 +5380,9 @@ _scsih_check_device(struct MPT3SAS_ADAPTER *ioc,
 		     MPI2_SAS_DEVICE0_FLAGS_ENCL_LEVEL_VALID) {
 			sas_device->enclosure_level =
 				le16_to_cpu(sas_device_pg0.EnclosureLevel);
-			memcpy(&sas_device->connector_name[0],
-				&sas_device_pg0.ConnectorName[0], 4);
+			memcpy(sas_device->connector_name,
+				sas_device_pg0.ConnectorName, 4);
+			sas_device->connector_name[4] = '\0';
 		} else {
 			sas_device->enclosure_level = 0;
 			sas_device->connector_name[0] = '\0';
@@ -5508,8 +5509,9 @@ _scsih_add_device(struct MPT3SAS_ADAPTER *ioc, u16 handle, u8 phy_num,
 	if (sas_device_pg0.Flags & MPI2_SAS_DEVICE0_FLAGS_ENCL_LEVEL_VALID) {
 		sas_device->enclosure_level =
 			le16_to_cpu(sas_device_pg0.EnclosureLevel);
-		memcpy(&sas_device->connector_name[0],
-			&sas_device_pg0.ConnectorName[0], 4);
+		memcpy(sas_device->connector_name,
+			sas_device_pg0.ConnectorName, 4);
+		sas_device->connector_name[4] = '\0';
 	} else {
 		sas_device->enclosure_level = 0;
 		sas_device->connector_name[0] = '\0';