erofs: use erofs_inode naming

As Christoph suggested [1], "Why is this called vnode instead
of inode?  That seems like a rather odd naming for a Linux
file system."

[1] https://lore.kernel.org/r/20190829101545.GC20598@infradead.org/
Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Link: https://lore.kernel.org/r/20190904020912.63925-10-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/erofs/xattr.h b/fs/erofs/xattr.h
index c5ca47d..3585b84 100644
--- a/fs/erofs/xattr.h
+++ b/fs/erofs/xattr.h
@@ -16,8 +16,8 @@
 
 static inline unsigned int inlinexattr_header_size(struct inode *inode)
 {
-	return sizeof(struct erofs_xattr_ibody_header)
-		+ sizeof(u32) * EROFS_V(inode)->xattr_shared_count;
+	return sizeof(struct erofs_xattr_ibody_header) +
+		sizeof(u32) * EROFS_I(inode)->xattr_shared_count;
 }
 
 static inline erofs_blk_t xattrblock_addr(struct erofs_sb_info *sbi,