Resolve another Lintian warning

diff --git a/debian/rules b/debian/rules
index 470f08b..47e7db1 100755 (executable)
--- a/debian/rules
+++ b/debian/rules
@@ -289,7 +289,7 @@ binary-arch: pkg-disorder pkg-disorder-server pkg-disorder-playrtp \
 binary-indep: 
 
 clean:
-       -$(MAKE) distclean
+       test -f Makefile && $(MAKE) distclean
        rm -f config.cache
        rm -f debian/files
        rm -f debian/substvars.*