Change in coreboot[master]: drivers/generic/adau7002/adau7002.c: Fix null pointer dereference

[Richard Spiegel (Code Review)]

Richard Spiegel has uploaded this change for review. ( https://review.coreboot.org/23760

Change subject: drivers/generic/adau7002/adau7002.c: Fix null pointer dereference
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drivers/generic/adau7002/adau7002.c: Fix null pointer dereference

Procedures acpi_device_scope() and acpi_device_name() can under certain
conditions return NULL. Check the return before using them.

This fixes CID 1385944
BUG=b:73331544
TEST=Build kahlee.

Change-Id: Ifcdf905100d22a1d828394f8685641eb432bb836
Signed-off-by: Richard Spiegel 
---
M src/drivers/generic/adau7002/adau7002.c
1 file changed, 7 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/60/23760/1

diff --git a/src/drivers/generic/adau7002/adau7002.c b/src/drivers/generic/adau7002/adau7002.c
index d21d513..1e1acf0 100644
--- a/src/drivers/generic/adau7002/adau7002.c
+++ b/src/drivers/generic/adau7002/adau7002.c
@@ -32,9 +32,14 @@
    if (!dev->enabled)
    	return;

+	const char *scope = acpi_device_scope(dev);
+	const char *name = acpi_device_name(dev);
+	if (!scope || !name)
+		return;
+
    /* Device */
-	acpigen_write_scope(acpi_device_scope(dev));
-	acpigen_write_device(acpi_device_name(dev));
+	acpigen_write_scope(scope);
+	acpigen_write_device(name);
    acpigen_write_name_string("_HID", ADAU7002_ACPI_HID);
    acpigen_write_name_integer("_UID", 0);
    acpigen_write_name_string("_DDN", dev->chip_ops->name);