[vim/vim] Fix some Coverity warnings (PR #15284)

[Christian Brabandt]

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/15284

Commit Summary

• e054a5e Fix Coverity overflow warning
• ad49c70 Fix Overflow warning in shift_line
• 093d587 overflow warning in syn_list_cluster
• 5ad0199 not checking return-value of mkdir()

File Changes

(4 files)

• M src/highlight.c (4)
• M src/ops.c (4)
• M src/spellfile.c (8)
• M src/syntax.c (4)

Patch Links:

• https://github.com/vim/vim/pull/15284.patch
• https://github.com/vim/vim/pull/15284.diff

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[Christian Brabandt]

@chrisbra pushed 1 commit.

• 0a631cb qsort may deref NULL pointer

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[Christian Brabandt]

@chrisbra pushed 1 commit.

• c54072b Problem: qsort may deref NULL pointer

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[Christian Brabandt]

@chrisbra pushed 1 commit.

• 4404956 Problem: qsort may deref NULL pointer

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[Christian Brabandt]

Closed #15284 via 220474d.

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