[PATCH] soc: fsl: guts: us devm_kstrdup_const() for RO data

[Nicholas Mc Guire]

devm_kstrdup() may return NULL if internal allocation failed, but
as  machine  is from the device tree, and thus RO, devm_kstrdup_const()
can be used here, which will only copy the reference.

Signed-off-by: Nicholas Mc Guire <hofrat@xxxxxxxxx>
Fixes: a6fc3b698130 ("soc: fsl: add GUTS driver for QorIQ platforms")
---

Problem located by experimental coccinelle script

Patch was compile tested with: multi_v7_defconfig (implies FSL_GUTS=y)

Patch is against 4.20-rc5 (localversion-next is next-20181207)

 drivers/soc/fsl/guts.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/fsl/guts.c b/drivers/soc/fsl/guts.c
index 302e0c8..15071ec 100644
--- a/drivers/soc/fsl/guts.c
+++ b/drivers/soc/fsl/guts.c
@@ -157,7 +157,8 @@ static int fsl_guts_probe(struct platform_device *pdev)
 		of_property_read_string_index(root, "compatible", 0, &machine);
 	of_node_put(root);
 	if (machine)
-		soc_dev_attr.machine = devm_kstrdup(dev, machine, GFP_KERNEL);
+		soc_dev_attr.machine = devm_kstrdup_const(dev, machine,
+							  GFP_KERNEL);
 
 	svr = fsl_guts_get_svr();
 	soc_die = fsl_soc_die_match(svr, fsl_soc_die);
-- 
2.1.4