networkd: show wireguard private key read error number

Noticed while looking at #35641

(cherry picked from commit 0543b02cf8211353c0bb1065e09614f551944a41)

diff --git a/src/network/netdev/wireguard.c b/src/network/netdev/wireguard.c
index 8d1dddf8288f644f7a51f35fdd75552d88b8d4f9..5a58e1082cf72ae5b09490938cf9752539055ed5 100644 (file)
--- a/src/network/netdev/wireguard.c
+++ b/src/network/netdev/wireguard.c
@@ -1198,7 +1198,7 @@ static int wireguard_verify(NetDev *netdev, const char *filename) {
         r = wireguard_read_key_file(w->private_key_file, w->private_key);
         if (r < 0)
                 return log_netdev_error_errno(netdev, r,
-                                              "Failed to read private key from %s. Ignoring network device.",
+                                              "Failed to read private key from '%s', ignoring network device: %m",
                                               w->private_key_file);
 
         if (eqzero(w->private_key)) {