[gupnp-igd] doc: Fix missing character in Makefile.am

[Olivier Crête <tester src gnome org>]

commit 67f8cc81d4e604491c4eeb76daf93759ad959b7c
Author: Olivier Crête <olivier crete collabora com>
Date:   Mon Nov 20 12:00:21 2017 -0500

    doc: Fix missing character in Makefile.am

 doc/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/doc/Makefile.am b/doc/Makefile.am
index c869776..c0f4eeb 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -84,7 +84,7 @@ EXTRA_DIST += version.xml.in
 # Files not to distribute
 # for --rebuild-types in $(SCAN_OPTIONS), e.g. $(DOC_MODULE).types
 # for --rebuild-sections in $(SCAN_OPTIONS) e.g. $(DOC_MODULE)-sections.txt
-DISTCLEANFILES = (DOC_MODULE).types
+DISTCLEANFILES = $(DOC_MODULE).types
 
 # Comment this out if you want your docs-status tested during 'make check'
 # TESTS = $(GTKDOC_CHECK)