8659 ata: unused but set warnings with GCC 5.X

*** 20,29 ****
--- 20,31 ----
   */
  
  /*
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
+  *
+  * Copyright 2017 RackTop Systems.
   */
  
  #include <sys/types.h>
  #include <sys/modctl.h>
  #include <sys/debug.h>
*** 3497,3515 ****
   * Initialize the power management components
   */
  static void
  ata_init_pm(dev_info_t *dip)
  {
          char            pmc_name[16];
          char            *pmc[] = {
                                  NULL,
                                  "0=Sleep (PCI D3 State)",
                                  "3=PowerOn (PCI D0 State)",
                                  NULL
                          };
!         int             instance;
!         ata_ctl_t       *ata_ctlp;
  
  
          instance = ddi_get_instance(dip);
          ata_ctlp = ddi_get_soft_state(ata_state, instance);
          ata_ctlp->ac_pm_support = 0;
--- 3499,3519 ----
   * Initialize the power management components
   */
  static void
  ata_init_pm(dev_info_t *dip)
  {
+         int             instance;
+         ata_ctl_t       *ata_ctlp;
+ #ifdef  ATA_USE_AUTOPM
          char            pmc_name[16];
          char            *pmc[] = {
                                  NULL,
                                  "0=Sleep (PCI D3 State)",
                                  "3=PowerOn (PCI D0 State)",
                                  NULL
                          };
! #endif
  
  
          instance = ddi_get_instance(dip);
          ata_ctlp = ddi_get_soft_state(ata_state, instance);
          ata_ctlp->ac_pm_support = 0;
*** 3516,3529 ****
  
          /* check PCI capabilities */
          if (!ata_is_pci(dip))
                  return;
  
          (void) sprintf(pmc_name, "NAME=ata%d", instance);
          pmc[0] = pmc_name;
  
- #ifdef  ATA_USE_AUTOPM
          if (ddi_prop_update_string_array(DDI_DEV_T_NONE, dip,
              "pm-components", pmc, 3) != DDI_PROP_SUCCESS) {
                  return;
          }
  #endif
--- 3520,3533 ----
  
          /* check PCI capabilities */
          if (!ata_is_pci(dip))
                  return;
  
+ #ifdef  ATA_USE_AUTOPM
          (void) sprintf(pmc_name, "NAME=ata%d", instance);
          pmc[0] = pmc_name;
  
          if (ddi_prop_update_string_array(DDI_DEV_T_NONE, dip,
              "pm-components", pmc, 3) != DDI_PROP_SUCCESS) {
                  return;
          }
  #endif