Suppyling a NULL lease is not a condition that needs to be asserted,
returning -EINVAL is informative enough to the caller. This simplifies
calling code and doesn't falsely indicate that something erroneous was
attempted.
---
 src/libsystemd-network/sd-dhcp6-lease.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libsystemd-network/sd-dhcp6-lease.c 
b/src/libsystemd-network/sd-dhcp6-lease.c
index e2715ea..8960fac 100644
--- a/src/libsystemd-network/sd-dhcp6-lease.c
+++ b/src/libsystemd-network/sd-dhcp6-lease.c
@@ -110,9 +110,11 @@ int dhcp6_lease_set_preference(sd_dhcp6_lease *lease, 
uint8_t preference) {
 }
 
 int dhcp6_lease_get_preference(sd_dhcp6_lease *lease, uint8_t *preference) {
-        assert_return(lease, -EINVAL);
         assert_return(preference, -EINVAL);
 
+        if (!lease)
+                return -EINVAL;
+
         *preference = lease->preference;
 
         return 0;
-- 
2.1.3

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