Attempt to fix sanitizer error

[paleolimbot]

Closes #236.

This doesn't seem to slow down covering calculations:

library(s2)

countries <- s2_data_countries()

bench::mark(
  s2_covering_cell_ids(countries, max_cells = 100)
)
#> # A tibble: 1 × 6
#>   expression                                            min   median `itr/sec`
#>   <bch:expr>                                       <bch:tm> <bch:tm>     <dbl>
#> 1 s2_covering_cell_ids(countries, max_cells = 100)    163ms    165ms      6.08
#> # ℹ 2 more variables: mem_alloc <bch:byt>, `gc/sec` <dbl>

In theory it allocates more memory during them, but I'm not sure that 64 * sizeof(void*) - even recursively - is causing much of a problem in its use here.

[codecov-commenter]

Codecov Report

Merging #238 (af66be2) into main (7dbf4d2) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main     #238   +/-   ##
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  Coverage   94.04%   94.04%           
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  Files          46       46           
  Lines        3524     3524           
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  Hits         3314     3314           
  Misses        210      210           

[edzer]

Will submit to CRAN with this PR.