confile: add clearer for lxc.logfile

src/lxc/confile.c

@@ -100,6 +100,7 @@ static int clr_config_loglevel(const char *, struct lxc_conf *);
 
 static int set_config_logfile(const char *, const char *, struct lxc_conf *);
 static int get_config_logfile(const char *, char *, int, struct lxc_conf *);
+static int clr_config_logfile(const char *, struct lxc_conf *);
 
 static int set_config_mount(const char *, const char *, struct lxc_conf *);
 static int get_config_mount(const char *, char *, int, struct lxc_conf *);
@@ -217,7 +218,7 @@ static struct lxc_config_t config[] = {
 	{ "lxc.cgroup",               set_config_cgroup,               get_config_cgroup,            clr_config_cgroup,            },
 	{ "lxc.id_map",               set_config_idmaps,               get_config_idmaps,            clr_config_idmaps,            },
 	{ "lxc.loglevel",             set_config_loglevel,             get_config_loglevel,          clr_config_loglevel,          },
-	{ "lxc.logfile",              set_config_logfile,              get_config_logfile,           NULL },
+	{ "lxc.logfile",              set_config_logfile,              get_config_logfile,           clr_config_logfile,           },
 	{ "lxc.mount.entry",          set_config_mount,                get_config_mount,             NULL },
 	{ "lxc.mount.auto",           set_config_mount_auto,           get_config_mount_auto,        NULL },
 	{ "lxc.mount",                set_config_fstab,	               get_config_fstab,             NULL },
@@ -2625,10 +2626,6 @@ int lxc_clear_config_item(struct lxc_conf *c, const char *key)
 		free(c->seccomp);
 		c->seccomp = NULL;
 
-	} else if (strcmp(key, "lxc.logfile") == 0) {
-		free(c->logfile);
-		c->logfile = NULL;
-
 	} else if (strcmp(key, "lxc.monitor.unshare") == 0) {
 		c->monitor_unshare = 0;
 
@@ -3777,3 +3774,10 @@ static inline int clr_config_loglevel(const char *key, struct lxc_conf *c)
 	c->loglevel = LXC_LOG_PRIORITY_NOTSET;
 	return 0;
 }
+
+static inline int clr_config_logfile(const char *key, struct lxc_conf *c)
+{
+	free(c->logfile);
+	c->logfile = NULL;
+	return 0;
+}