update zfsonlinux module

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/submodules/zfsonlinux b/submodules/zfsonlinux
index 8f4d852dcdae10db7800a7007f0ac249536c49f8..5548e2b0b1d21b6b8bf05ef1c1313d16be7df418 160000 (submodule)
--- a/submodules/zfsonlinux
+++ b/submodules/zfsonlinux
@@ -1 +1 @@
-Subproject commit 8f4d852dcdae10db7800a7007f0ac249536c49f8
+Subproject commit 5548e2b0b1d21b6b8bf05ef1c1313d16be7df418