ASoC: SOF: topology: Check w->sname validity once in sof_connect_dai_widget()

ASoC: SOF: topology: Check w->sname validity once in sof_connect_dai_widget()

The 'w' (struct snd_soc_dapm_widget) is not changing within the function,
there is no reason to check the w->sname more than once as it is not
going to change.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220421201847.1545686-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>