confile: add clearer for lxc.console.logfile

src/lxc/confile.c

@@ -174,6 +174,7 @@ static int clr_config_cap_keep(const char *, struct lxc_conf *);
 
 static int set_config_console_logfile(const char *, const char *, struct lxc_conf *);
 static int get_config_console_logfile(const char *, char *, int, struct lxc_conf *);
+static int clr_config_console_logfile(const char *, struct lxc_conf *);
 
 static int set_config_console(const char *, const char *, struct lxc_conf *);
 static int get_config_console(const char *, char *, int, struct lxc_conf *);
@@ -272,7 +273,7 @@ static struct lxc_config_t config[] = {
 	{ "lxc.network",              set_config_network,              get_config_network,           clr_config_network,           },
 	{ "lxc.cap.drop",             set_config_cap_drop,             get_config_cap_drop,          clr_config_cap_drop,          },
 	{ "lxc.cap.keep",             set_config_cap_keep,             get_config_cap_keep,          clr_config_cap_keep,          },
-	{ "lxc.console.logfile",      set_config_console_logfile,      get_config_console_logfile,   NULL },
+	{ "lxc.console.logfile",      set_config_console_logfile,      get_config_console_logfile,   clr_config_console_logfile,   },
 	{ "lxc.console",              set_config_console,              get_config_console,           clr_config_console,           },
 	{ "lxc.seccomp",              set_config_seccomp,              get_config_seccomp,           NULL },
 	{ "lxc.include",              set_config_includefile,          NULL,                         NULL },
@@ -2581,10 +2582,6 @@ int lxc_clear_config_item(struct lxc_conf *c, const char *key)
 	} else if (strcmp(key, "lxc.ephemeral") == 0) {
 		c->ephemeral = 0;
 
-	} else if (strcmp(key, "lxc.console.logfile") == 0) {
-		free(c->console.log_path);
-		c->console.log_path = NULL;
-
 	} else if (strcmp(key, "lxc.autodev") == 0) {
 		c->autodev = 1;
 
@@ -3837,3 +3834,10 @@ static inline int clr_config_console(const char *key, struct lxc_conf *c)
 	return 0;
 }
 
+static inline int clr_config_console_logfile(const char *key,
+					     struct lxc_conf *c)
+{
+	free(c->console.log_path);
+	c->console.log_path = NULL;
+	return 0;
+}