move disable backup flag to correct spot

Author: jpbland1

Diff for: src/update_flash.c

@@ -493,18 +493,18 @@ static int wolfBoot_delta_update(struct wolfBoot_image *boot,
         wb_flash_erase(boot, sector * WOLFBOOT_SECTOR_SIZE, WOLFBOOT_SECTOR_SIZE);
         sector++;
     }
-#ifndef DISABLE_BACKUP
-#endif
 out:
 #ifdef EXT_FLASH
     ext_flash_lock();
 #endif
     hal_flash_lock();
     /* start re-entrant final erase, return code is only for resumption in
      * wolfBoot_start */
+#ifndef DISABLE_BACKUP
     if (ret == 0) {
         wolfBoot_swap_and_final_erase(0);
     }
+#endif
     /* encryption key was not erased, will be erased by success */
     return ret;
 }