ASoC: fsl: Fix of-node refcount unbalance in fsl_ssi_probe_from_dt()

BugLink: https://bugs.launchpad.net/bugs/1848589

commit 2757970f upstream.

The node obtained from of_find_node_by_path() has to be unreferenced
after the use, but we forgot it for the root node.

Fixes: f0fba2ad ("ASoC: multi-component - ASoC Multi-Component Support")
Cc: Timur Tabi <timur@kernel.org>
Cc: Nicolin Chen <nicoleotsuka@gmail.com>
Cc: Xiubo Li <Xiubo.Lee@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

sound/soc/fsl/fsl_ssi.c

@@ -1374,6 +1374,7 @@ static int fsl_ssi_probe(struct platform_device *pdev)
 	struct fsl_ssi_private *ssi_private;
 	int ret = 0;
 	struct device_node *np = pdev->dev.of_node;
+	struct device_node *root;
 	const struct of_device_id *of_id;
 	const char *p, *sprop;
 	const uint32_t *iprop;
@@ -1510,7 +1511,9 @@ static int fsl_ssi_probe(struct platform_device *pdev)
 	 * device tree.  We also pass the address of the CPU DAI driver
 	 * structure.
 	 */
-	sprop = of_get_property(of_find_node_by_path("/"), "compatible", NULL);
+	root = of_find_node_by_path("/");
+	sprop = of_get_property(root, "compatible", NULL);
+	of_node_put(root);
 	/* Sometimes the compatible name has a "fsl," prefix, so we strip it. */
 	p = strrchr(sprop, ',');
 	if (p)