ASoC: cygnus: remove redundant assignment to pointer 'res'

The pointer res is being initialized with a value that is never read
and re-assigned immediately after, hence the initialization is redundant
and can be removed.

Cleans up clang warning:
sound/soc/bcm/cygnus-ssp.c:1284:19: warning: Value stored to 'res'
during its initialization is never read

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/bcm/cygnus-ssp.c

@@ -1281,7 +1281,7 @@ static int cygnus_ssp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *child_node;
-	struct resource *res = pdev->resource;
+	struct resource *res;
 	struct cygnus_audio *cygaud;
 	int err = -EINVAL;
 	int node_count;