switch xattr_handler->set() to passing dentry and inode separately

preparation for similar switch in ->setxattr() (see the next commit for
rationale).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 1cc4c57..76beb20 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -33,8 +33,8 @@
 		   struct inode *inode, const char *name, void *buffer,
 		   size_t size);
 	int (*set)(const struct xattr_handler *, struct dentry *dentry,
-		   const char *name, const void *buffer, size_t size,
-		   int flags);
+		   struct inode *inode, const char *name, const void *buffer,
+		   size_t size, int flags);
 };
 
 const char *xattr_full_name(const struct xattr_handler *, const char *);