Fixed typo: added missing right parentheses.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8850 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index ca14cbc..dd96edd 100644
--- a/configure.in
+++ b/configure.in
@@ -1165,7 +1165,7 @@
 [
   int variable = 1;
   return (__sync_bool_compare_and_swap(&variable, 1, 2)
-         && __sync_add_and_fetch(&variable, 1) ? 1 : 0
+         && __sync_add_and_fetch(&variable, 1) ? 1 : 0)
 ],
 [
   AC_MSG_RESULT([yes])