coverity: fix mount_entry_create_dir_file

src/lxc/conf.c

@@ -2139,7 +2139,7 @@ static int mount_entry_create_dir_file(const struct mntent *mntent,
 				       const char* path)
 {
 	char *pathdirname = NULL;
-	int ret;
+	int ret = 0;
 	FILE *pathfile = NULL;
 
 	if (hasmntopt(mntent, "create=dir")) {
@@ -2177,6 +2177,12 @@ static inline int mount_entry_on_generic(struct mntent *mntent,
 
 	ret = mount_entry_create_dir_file(mntent, path);
 
+	if (ret < 0)
+		return optional ? 0 : -1;
+
+	if (ret < 0 && !optional)
+		return -1;
+
 	cull_mntent_opt(mntent);
 
 	if (parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata) < 0) {