Work is guaranteed to be initialized on exit. Drop the unnecessary
if statement and always call flush_work.
This fixes a warning seen with clang:
sound/soc/codecs/pcm1789.c:265:13: warning: address of 'priv->work' will
      always evaluate to 'true' [-Wpointer-bool-conversion]
        if (&priv->work)
        ~~   ~~~~~~^~~~
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Mark Brown <broonie@kernel.org>
 {
        struct pcm1789_private *priv = dev_get_drvdata(dev);
 
-       if (&priv->work)
-               flush_work(&priv->work);
+       flush_work(&priv->work);
 
        return 0;
 }