Compiled out conditionally debug-oriented code

Although ntfs_log_trace() is defined to a no-op in non-DEBUG builds,
ntfs_attr_name_get() is not.  This function performs a string conversion
and a memory allocation, so it is nice to have the call to it compiled
out when not needed.

Signed-off-by: Eric Biggers <ebiggers3@gmail.com>

libntfs-3g/dir.c

@@ -1906,17 +1906,21 @@ int ntfs_delete(ntfs_volume *vol, const char *pathname,
 search:
 	while (!(err = ntfs_attr_lookup(AT_FILE_NAME, AT_UNNAMED, 0,
 					CASE_SENSITIVE, 0, NULL, 0, actx))) {
+	#ifdef DEBUG
 		char *s;
+	#endif
 		IGNORE_CASE_BOOL case_sensitive = IGNORE_CASE;
 
 		fn = (FILE_NAME_ATTR*)((u8*)actx->attr +
 				le16_to_cpu(actx->attr->value_offset));
+	#ifdef DEBUG
 		s = ntfs_attr_name_get(fn->file_name, fn->file_name_length);
 		ntfs_log_trace("name: '%s'  type: %d  dos: %d  win32: %d  "
 			       "case: %d\n", s, fn->file_name_type,
 			       looking_for_dos_name, looking_for_win32_name,
 			       case_sensitive_match);
 		ntfs_attr_name_free(&s);
+	#endif
 		if (looking_for_dos_name) {
 			if (fn->file_name_type == FILE_NAME_DOS)
 				break;