GH-45605: [R][C++] Fix identifier ... preceded by whitespace warnings

[jonkeane]

Rationale for this change

Fix warnings, pass on CRAN

What changes are included in this PR?

Removing some whitespace

Are these changes tested?

YEs

Are there any user-facing changes?

No, other than being releasable on CRAN

• GitHub Issue: [R][C++] Fix identifier ... preceded by whitespace warnings #45605

[jonkeane]

@github-actions crossbow submit test-r-linux-as-cran

[github-actions]

Revision: c81bfb0

Submitted crossbow builds: ursacomputing/crossbow @ actions-4e0e69ed96

Task	Status
test-r-linux-as-cran

[jonkeane]

@github-actions crossbow submit test-r-linux-as-cran

[github-actions]

Revision: 27b318c

Submitted crossbow builds: ursacomputing/crossbow @ actions-72b7eea56e

Task	Status
test-r-linux-as-cran

[jonkeane]

The clang20 job is failing due to not having latex (cf r-hub/containers#23) which we can ignore in this case, but won't be able to add it to the matrix if we need to ignore it — that's ok though, we just need to check this. It doesn't reproduce the failure we saw on CRAN but the clang20 image is out of date from r-hub. I pushed r-hub/containers#89 upstream to update the clang20 build, and then once that's failing can see if we get that same error.

[jonkeane]

@github-actions crossbow submit test-r-linux-as-cran

[github-actions]

Failed to render template `r/github.linux.cran.yml` with UndefinedError: 'matrix' is undefined
The Archery job run can be found at: https://github.com/apache/arrow/actions/runs/13486720494

[jonkeane]

@github-actions crossbow submit test-r-linux-as-cran

[github-actions]

Failed to render template `r/github.linux.cran.yml` with UndefinedError: 'matrix' is undefined
The Archery job run can be found at: https://github.com/apache/arrow/actions/runs/13486744445

[jonkeane]

@github-actions crossbow submit test-r-linux-as-cran

[github-actions]

Revision: 1f5438d

Submitted crossbow builds: ursacomputing/crossbow @ actions-c4c3a36e7c

Task	Status
test-r-linux-as-cran

[kou]

Can we remove this?

arrow/dev/tasks/tasks.yml

Lines 1157 to 1158 in 12cdaaa

	params:
	MATRIX: {{ "${{ matrix.r_image }}" }}