Makefile: Fix 'make distclean'

We forgot the '-r' option on the rm command to clean up the
Sphinx .doctrees working directory, which meant that
"make distclean" fails:
 rm: cannot remove '.doctrees': Is a directory

Add the missing option.

Fixes: 5f71eac06e15b9a3fa1134d446f ("Makefile, configure: Support building rST documentation")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190308135744.6480-3-peter.maydell@linaro.org

diff --git a/Makefile b/Makefile
index 0194ef7..9fd7f3f 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -691,7 +691,7 @@ distclean: clean
        rm -f docs/interop/qemu-qmp-ref.html docs/interop/qemu-ga-ref.html
        rm -f docs/qemu-block-drivers.7
        rm -f docs/qemu-cpu-models.7
-       rm -f .doctrees
+       rm -rf .doctrees
        $(call clean-manual,devel)
        $(call clean-manual,interop)
        for d in $(TARGET_DIRS); do \