[PATCH] man: Fix typo and use $() for make expressions

[Thierry Reding]

Due to the typo, none of the .xml files would end up in the release
tarball and cause make distcheck as well as builds from the tarball to
fail.

Using $() isn't strictly necessary but other variables and expressions
use that variant already so it makes the usage consistent.

Signed-off-by: Thierry Reding <thierry.reding at avionic-design.de>
---
 man/Makefile.am | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/man/Makefile.am b/man/Makefile.am
index 25202e2..d25a293 100644
--- a/man/Makefile.am
+++ b/man/Makefile.am
@@ -17,7 +17,8 @@ MANPAGES_ALIASES = \
 	drm-ttm.7
 
 XML_FILES = \
-	${patsubst %.1,%.xml,${patsubst %.3,%.xml,${patsubst %.5,%.xml,${patsubs %.7,%.xml,$(MANPAGES)}}}}
+	$(patsubst %.1,%.xml,$(patsubst %.3,%.xml,$(patsubst %.5,%.xml,$(patsubst %.7,%.xml,$(MANPAGES)))))
+
 EXTRA_DIST = $(XML_FILES)
 CLEANFILES = $(MANPAGES) $(MANPAGES_ALIASES) .man_fixup
 man_MANS =
-- 
1.8.1.1