networkd: fix __FUNCTION__ macro and implicit boolean condition

Author: slyon

src/networkd.c

@@ -42,11 +42,11 @@ _netplan_sysfs_get_mac_by_ifname(const char* ifname, const char* rootdir)
 {
     g_autofree gchar* content = NULL;
     g_autofree gchar* sysfs_path = NULL;
-    sysfs_path = g_build_path(G_DIR_SEPARATOR_S, rootdir ?: G_DIR_SEPARATOR_S,
+    sysfs_path = g_build_path(G_DIR_SEPARATOR_S, !!rootdir ?: G_DIR_SEPARATOR_S,
                               "sys", "class", "net", ifname, "address", NULL);
 
     if (!g_file_get_contents (sysfs_path, &content, NULL, NULL)) {
-        g_debug("%s: Cannot read file contents.", __FUNCTION__);
+        g_debug("%s: Cannot read file contents.", __func__);
         return NULL;
     }
 
@@ -63,12 +63,12 @@ _netplan_sysfs_get_driver_by_ifname(const char* ifname, const char* rootdir)
 {
     g_autofree gchar* link = NULL;
     g_autofree gchar* sysfs_path = NULL;
-    sysfs_path = g_build_path(G_DIR_SEPARATOR_S, rootdir ?: G_DIR_SEPARATOR_S,
+    sysfs_path = g_build_path(G_DIR_SEPARATOR_S, !!rootdir ?: G_DIR_SEPARATOR_S,
                               "sys", "class", "net", ifname, "device", "driver", NULL);
 
     link = g_file_read_link(sysfs_path, NULL);
     if (!link) {
-        g_debug("%s: Cannot read symlink of %s.", __FUNCTION__, sysfs_path);
+        g_debug("%s: Cannot read symlink of %s.", __func__, sysfs_path);
         return NULL;
     }