Don't use dh_testroot in debian/rules clean.

debian/changelog

@@ -11,6 +11,7 @@ x11-xserver-utils (7.6+4) UNRELEASED; urgency=low
   * xgamma 1.0.5.
   * xhost 1.0.5.
   * xmodmap 1.0.7.
+  * Don't use dh_testroot in debian/rules clean.
 
   [ Moritz Muehlenhoff ]
   * Enable hardened build flags (closes: #655503)

debian/rules

@@ -56,15 +56,12 @@ $(STAMP_DIR)/build-%: $(STAMP_DIR)/genscripts $(STAMP_DIR)/patch
 
 clean: xsfclean
 	dh_testdir
-	dh_testroot
 	rm -f build-stamp
-
 	rm -f config.cache config.log config.status
 	rm -f */config.cache */config.log */config.status
 	rm -f conftest* */conftest*
 	rm -rf autom4te.cache */autom4te.cache
 	rm -rf *-build
-
 	dh_clean
 
 install: build