fs: Do not overload update_time

update_time() also has an internal function pointer
update_time. Even though this works correctly, it is
confusing to the readers.

Just use a regular if statement to call the generic
function or the function pointer.

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>