ASoC: cygnus: fix for_each_child.cocci warnings

Function "for_each_available_child_of_node" should have of_node_put()
before return around line 1352.

Generated by: scripts/coccinelle/iterators/for_each_child.cocci

CC: Sumera Priyadarsini <sylphrenadin@gmail.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>
Link: https://lore.kernel.org/r/alpine.DEB.2.22.394.2103281651320.2854@hadrien
Signed-off-by: Mark Brown <broonie@kernel.org>