hpsa: set the enclosure identifier to zero

This has only called from show_sas_rphy_enclosure_identifier().  The
caller expects that we set an identifier, otherwise it uses an
uninitialized variable.

[mkp: fixed typo]
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hpsa.c

@@ -9602,6 +9602,7 @@ hpsa_sas_get_linkerrors(struct sas_phy *phy)
 static int
 hpsa_sas_get_enclosure_identifier(struct sas_rphy *rphy, u64 *identifier)
 {
+	*identifier = 0;
 	return 0;
 }