docs-rst: fix media cleandocs target

The builddir prefix was missing on make cleandocs. Fix it.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/Makefile.sphinx

@@ -98,7 +98,7 @@ installmandocs:
 
 cleandocs:
 	$(Q)rm -rf $(BUILDDIR)
-	$(Q)$(MAKE) -C Documentation/media clean
+	$(Q)$(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) -C Documentation/media clean
 
 endif # HAVE_SPHINX
 

Documentation/media/Makefile

@@ -105,7 +105,7 @@ xml: all
 latex: $(IMGPDF) all
 
 clean:
-	-rm -f $(DOTTGT) $(IMGTGT) $(patsubst %,$(SRC_DIR)/%,${TARGETS}) 2>/dev/null
+	-rm -f $(DOTTGT) $(IMGTGT) ${TARGETS} 2>/dev/null
 
 $(BUILDDIR):
 	$(Q)mkdir -p $@