mm: kmemleak: factor object reference updating out of scan_block()

mm: kmemleak: factor object reference updating out of scan_block()

scan_block() updates the number of references (pointers) to objects,
adding them to the gray_list when object->min_count is reached.  The
patch factors out this functionality into a separate update_refs()
function.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: "Luis R. Rodriguez" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>