constify value pointer for qdev_prop_set_string

qdev_prop_set_string uses object_property_set_str, which takes
a const char * for the value. Lets propagate the constness
into qdev_prop_set_string.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/qdev-properties.c

@@ -1123,7 +1123,7 @@ void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value)
     assert_no_error(errp);
 }
 
-void qdev_prop_set_string(DeviceState *dev, const char *name, char *value)
+void qdev_prop_set_string(DeviceState *dev, const char *name, const char *value)
 {
     Error *errp = NULL;
     object_property_set_str(OBJECT(dev), value, name, &errp);

hw/qdev.h

@@ -316,7 +316,7 @@ void qdev_prop_set_uint16(DeviceState *dev, const char *name, uint16_t value);
 void qdev_prop_set_uint32(DeviceState *dev, const char *name, uint32_t value);
 void qdev_prop_set_int32(DeviceState *dev, const char *name, int32_t value);
 void qdev_prop_set_uint64(DeviceState *dev, const char *name, uint64_t value);
-void qdev_prop_set_string(DeviceState *dev, const char *name, char *value);
+void qdev_prop_set_string(DeviceState *dev, const char *name, const char *value);
 void qdev_prop_set_chr(DeviceState *dev, const char *name, CharDriverState *value);
 void qdev_prop_set_netdev(DeviceState *dev, const char *name, VLANClientState *value);
 void qdev_prop_set_vlan(DeviceState *dev, const char *name, VLANState *value);