tidy up after d_make_root() conversion

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/mm/shmem.c b/mm/shmem.c
index 154243f..9bc4a23 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2175,7 +2175,6 @@
 int shmem_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct inode *inode;
-	struct dentry *root;
 	struct shmem_sb_info *sbinfo;
 	int err = -ENOMEM;
 
@@ -2232,10 +2231,9 @@
 		goto failed;
 	inode->i_uid = sbinfo->uid;
 	inode->i_gid = sbinfo->gid;
-	root = d_make_root(inode);
-	if (!root)
+	sb->s_root = d_make_root(inode);
+	if (!sb->s_root)
 		goto failed;
-	sb->s_root = root;
 	return 0;
 
 failed: