ASoC: topology: Fix memory leak in widget creation

name and sname allocated in widget create are not freed when
creation is successful, so free them.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>