Fix condition when checking changes on restore

rdiff_backup/restore.py

@@ -243,9 +243,8 @@ class MirrorStruct:
 		for mir_rorp, target_rorp in collated:
 			if Globals.preserve_hardlinks and mir_rorp:
 				Hardlink.add_rorp(mir_rorp, target_rorp)
-			if (not target_rorp or not mir_rorp or
-				not mir_rorp == target_rorp or
-				(Globals.preserve_hardlinks and not
+			if not (target_rorp and mir_rorp and target_rorp == mir_rorp and
+				(not Globals.preserve_hardlinks or
 				 Hardlink.rorp_eq(mir_rorp, target_rorp))):
 				diff = cls.get_diff(mir_rorp, target_rorp)
 			else: diff = None