ASoC: soc-core: return 0 if np was NULL on snd_soc_daifmt_parse_clock_provider_raw()

snd_soc_daifmt_parse_clock_provider_raw() might be called with NULL np.
Return 0 in such case.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Stephen Gordon <gordoste@iinet.net.au>
Link: https://patch.msgid.link/87ttaco5jm.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: morimoto

sound/soc/soc-core.c

@@ -3369,6 +3369,9 @@ unsigned int snd_soc_daifmt_parse_clock_provider_raw(struct device_node *np,
 	char prop[128];
 	unsigned int bit, frame;
 
+	if (!np)
+		return 0;
+
 	if (!prefix)
 		prefix = "";