fix string outputs from UDF

[aplavin]

Not sure why "+1" was there, but it lead to an extra nul byte at the end.

[ImreSamu]

Maybe related issue: #147 ?

[aplavin]

Yes, I believe that issue is exactly what I fix here. The +1 lead to trailing 00 as seen in your hex outputs.

[codecov]

Codecov Report

Merging #250 (957403f) into master (b4d80a9) will increase coverage by 0.55%.
The diff coverage is n/a.

❗ Current head 957403f differs from pull request most recent head 00fc933. Consider uploading reports for the commit 00fc933 to get more accurate results

@@            Coverage Diff             @@
##           master     #250      +/-   ##
==========================================
+ Coverage   83.19%   83.74%   +0.55%     
==========================================
  Files           5        5              
  Lines         607      603       -4     
==========================================
  Hits          505      505              
+ Misses        102       98       -4     

Impacted Files	Coverage Δ
src/api.jl	41.66% <ø> (+1.17%)	⬆️
src/consts.jl	85.71% <0.00%> (-3.18%)	⬇️
src/SQLite.jl	96.62% <0.00%> (+0.40%)	⬆️
src/UDF.jl	85.71% <0.00%> (+0.79%)	⬆️

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[quinnj]

Thanks for the fix! Looks like the same only issue as the other PR.

[quinnj]

Ah shoot, looks like only wasn't introduced until Julia 1.4, so we still have the error.