mm: kvfree the swap cluster info if the swap file is unsatisfactory

mm: kvfree the swap cluster info if the swap file is unsatisfactory

If initializing a small swap file fails because the swap file has a
problem (holes, etc.) then we need to free the cluster info as part of
cleanup.  Unfortunately a previous patch changed the code to use kvzalloc
but did not change all the vfree calls to use kvfree.

Found by running generic/357 from xfstests.

Link: http://lkml.kernel.org/r/20170831233515.GR3775@magnolia
Fixes: 54f180d3c181 ("mm, swap: use kvzalloc to allocate some swap data structures")
Signed-off-by: Darrick J. Wong <[email protected]>
Reviewed-by: "Huang, Ying" <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: <[email protected]>	[4.12+]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>