mm: vmalloc: add a scan area of VA only once

Invoke a kmemleak_scan_area() function only for newly allocated objects to
add a scan area within that object.  There is no reason to add a same scan
area(pointer to beginning or inside the object) several times.  If a VA is
obtained from the cache its scan area has already been associated.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 7db166b4aa0d ("mm: vmalloc: offload free_vmap_area_lock lock")
Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>
Reviewed-by: Lorenzo Stoakes <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Joel Fernandes (Google) <[email protected]>
Cc: Kazuhito Hagio <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Oleksiy Avramchenko <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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