ASoC: soc-core: Fix sparse warning in be32_to_cpup() call

Store return value of of_get_property() to a pointer of __be32 type as
device tree has big endian type. This fixes a sparse warning couple of
lines later when be32_to_cpup() is used to convert from big endian to
cpu endian.

The whole conversion is not really necessary, as we are only checking
if the value is zero or not, but I wanted to add it to remind in the
future that the data has to be converted before use. Compiler should
optimize the unnecessary operations away.
Signed-off-by: NJyri Sarha <jsarha@ti.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -3296,7 +3296,7 @@ static int snd_soc_of_get_slot_mask(struct device_node *np,
 				    unsigned int *mask)
 {
 	u32 val;
-	const u32 *of_slot_mask = of_get_property(np, prop_name, &val);
+	const __be32 *of_slot_mask = of_get_property(np, prop_name, &val);
 	int i;
 
 	if (!of_slot_mask)