ASoC: eureka-tlv320: Hold reference returned from of_find_xxx API

In eukrea_tlv320_probe(), we need to hold the reference returned
from of_find_compatible_node() which has increased the refcount
and then call of_node_put() with it when done.

Fixes: 66f23290 ("ASoC: eukrea-tlv320: Add DT support.")
Co-authored-by: Kelin Wang <wangkelin2023@163.com>
Signed-off-by: Liang He <windhl@126.com>
Link: https://lore.kernel.org/r/20220914134354.3995587-1-windhl@126.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/eukrea-tlv320.c

@@ -86,7 +86,7 @@ static int eukrea_tlv320_probe(struct platform_device *pdev)
 	int ret;
 	int int_port = 0, ext_port;
 	struct device_node *np = pdev->dev.of_node;
-	struct device_node *ssi_np = NULL, *codec_np = NULL;
+	struct device_node *ssi_np = NULL, *codec_np = NULL, *tmp_np = NULL;
 
 	eukrea_tlv320.dev = &pdev->dev;
 	if (np) {
@@ -143,7 +143,7 @@ static int eukrea_tlv320_probe(struct platform_device *pdev)
 	}
 
 	if (machine_is_eukrea_cpuimx27() ||
-	    of_find_compatible_node(NULL, NULL, "fsl,imx21-audmux")) {
+	    (tmp_np = of_find_compatible_node(NULL, NULL, "fsl,imx21-audmux"))) {
 		imx_audmux_v1_configure_port(MX27_AUDMUX_HPCR1_SSI0,
 			IMX_AUDMUX_V1_PCR_SYN |
 			IMX_AUDMUX_V1_PCR_TFSDIR |
@@ -158,10 +158,11 @@ static int eukrea_tlv320_probe(struct platform_device *pdev)
 			IMX_AUDMUX_V1_PCR_SYN |
 			IMX_AUDMUX_V1_PCR_RXDSEL(MX27_AUDMUX_HPCR1_SSI0)
 		);
+		of_node_put(tmp_np);
 	} else if (machine_is_eukrea_cpuimx25sd() ||
 		   machine_is_eukrea_cpuimx35sd() ||
 		   machine_is_eukrea_cpuimx51sd() ||
-		   of_find_compatible_node(NULL, NULL, "fsl,imx31-audmux")) {
+		   (tmp_np = of_find_compatible_node(NULL, NULL, "fsl,imx31-audmux"))) {
 		if (!np)
 			ext_port = machine_is_eukrea_cpuimx25sd() ?
 				4 : 3;
@@ -178,6 +179,7 @@ static int eukrea_tlv320_probe(struct platform_device *pdev)
 			IMX_AUDMUX_V2_PTCR_SYN,
 			IMX_AUDMUX_V2_PDCR_RXDSEL(int_port)
 		);
+		of_node_put(tmp_np);
 	} else {
 		if (np) {
 			/* The eukrea,asoc-tlv320 driver was explicitly