libglnx: fix reference to commit

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

diff --git a/libglnx b/libglnx
index 2558e0ea35712aed27234fd1ad4a5bac4fae3817..be6bc2d75d390959f24fcc53edf3f4ddfdcddbaf 160000 (submodule)
--- a/libglnx
+++ b/libglnx
@@ -1 +1 @@
-Subproject commit 2558e0ea35712aed27234fd1ad4a5bac4fae3817
+Subproject commit be6bc2d75d390959f24fcc53edf3f4ddfdcddbaf