logfs get_sb massage, part 1

move allocation of logfs_super to logfs_get_sb, pass it to
logfs_get_sb_...().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/logfs/dev_mtd.c b/fs/logfs/dev_mtd.c
index a85d47d..e886cdc 100644
--- a/fs/logfs/dev_mtd.c
+++ b/fs/logfs/dev_mtd.c
@@ -265,14 +265,17 @@
 	.put_device	= mtd_put_device,
 };
 
-int logfs_get_sb_mtd(struct file_system_type *type, int flags,
+int logfs_get_sb_mtd(struct logfs_super *s,
+		struct file_system_type *type, int flags,
 		int mtdnr, struct vfsmount *mnt)
 {
 	struct mtd_info *mtd;
 	const struct logfs_device_ops *devops = &mtd_devops;
 
 	mtd = get_mtd_device(NULL, mtdnr);
-	if (IS_ERR(mtd))
+	if (IS_ERR(mtd)) {
+		kfree(s);
 		return PTR_ERR(mtd);
-	return logfs_get_sb_device(type, flags, mtd, NULL, devops, mnt);
+	}
+	return logfs_get_sb_device(s, type, flags, mtd, NULL, devops, mnt);
 }