[SPARC/64] constify of_get_property return: sound

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/sound/sparc/cs4231.c b/sound/sparc/cs4231.c
index f5956d5..900a00d 100644
--- a/sound/sparc/cs4231.c
+++ b/sound/sparc/cs4231.c
@@ -2284,7 +2284,7 @@
 			if (!strcmp(edev->prom_node->name, "SUNW,CS4231")) {
 				match = 1;
 			} else if (!strcmp(edev->prom_node->name, "audio")) {
-				char *compat;
+				const char *compat;
 
 				compat = of_get_property(edev->prom_node,
 							 "compatible", NULL);