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Add a helper function for testing a swap block and freeing it if empty.

Description

Add a helper function for testing a swap block and freeing it if empty.

Submitted by: ota_j.email.ne.jp
Approved by: alc, kib, dougm
Differential Revision: https://reviews.freebsd.org/D22402

Details

Provenance
dougmAuthored on
Differential Revision
D22402: Create swp_pager_free_empty_swblk function to free if a swblk is free.
Parents
rS354794: MFC r354520:
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