src/dmclock: bring in fixes for indirect_intrusive_heap

Signed-off-by: Samuel Just <sjust@redhat.com>

diff --git a/src/dmclock b/src/dmclock
index 47703948cb73d3c858cdf0701b741bb82978020a..1961f9045f3e55fd1a1fac513f041b446adf100a 160000 (submodule)
--- a/src/dmclock
+++ b/src/dmclock
@@ -1 +1 @@
-Subproject commit 47703948cb73d3c858cdf0701b741bb82978020a
+Subproject commit 1961f9045f3e55fd1a1fac513f041b446adf100a