exofs: confusion between kmap() and kmap_atomic() api

For kmap_atomic() we call kunmap_atomic() on the returned pointer.
That's different from kmap() and kunmap() and so it's easy to get them
backwards.

Cc: Stable <stable@kernel.org>
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NBoaz Harrosh <bharrosh@panasas.com>

fs/exofs/dir.c

@@ -608,7 +608,7 @@ int exofs_make_empty(struct inode *inode, struct inode *parent)
 	de->inode_no = cpu_to_le64(parent->i_ino);
 	memcpy(de->name, PARENT_DIR, sizeof(PARENT_DIR));
 	exofs_set_de_type(de, inode);
-	kunmap_atomic(page, KM_USER0);
+	kunmap_atomic(kaddr, KM_USER0);
 	err = exofs_commit_chunk(page, 0, chunk_size);
 fail:
 	page_cache_release(page);