iov_iter_get_pages_alloc(): lift freeing pages array on failure exits into wrapper
Incidentally, ITER_XARRAY did *not* free the sucker in case when iter_xarray_populate_pages() returned 0... Reviewed-by: NJeff Layton <jlayton@kernel.org> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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