[vim/vim] patch 9.2.$version: memory leak when reading a spell file with SN_SAL… (PR #20836)

… and SN_SOFO

Problem:  Memory leak when a spell file has an SN_SAL section before an
          SN_SOFO section: set_sofo() reuses sl_sal without freeing the
          salitem_T entries left by read_sal_section() (after v9.2.0846).
Solution: Factor the SAL free loop into free_sal_items() and call it
          before set_sofo() reuses sl_sal.

closes:  #PR

Supported by AI.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20836

-- Commit Summary --

  * patch 9.2.$version: memory leak when reading a spell file with SN_SAL and SN_SOFO

-- File Changes --

    M src/proto/spell.pro (1)
    M src/spell.c (39)
    M src/spellfile.c (2)

-- Patch Links --

https://github.com/vim/vim/pull/20836.patch
https://github.com/vim/vim/pull/20836.diff

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