[Chapel Merge] Fix off-by-one error that resulted from #17309

Branch: refs/heads/master
Revision: 8a25087
Author: bradcray
Log Message:

Merge pull request #17366 from bradcray/skip-spa-perf-obo

Fix off-by-one error that resulted from #17309

[reviewed by @mstrout]

This presumably got missed because it is skipped if BLAS and/or LAPACK
aren't available due to the directory SKIPIF? Yet I'm able to run it
on my Mac where I'm not aware I have those available, so we may be
casting too wide a net in the SKIPIF?

Also interesting: part of the reason this test is sensitive to the numbering
is that it pokes into the sparse array's internals rather than just relying
on public interfaces.

Modified Files:
M test/library/packages/LinearAlgebra/performance/SPA-perf.chpl

Compare: https://github.com/chapel-lang/chapel/compare/8efc7769b094...8a250877907c