xds interop: Fix buildscripts not continuing on a failed test suite (v1.52.x backport) #5938
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Backport of #5937 to v1.52.x.
Apparently there's a difference between bash 3 and bash 4. OSX comes with bash 3 out-of-box, so for whoever wrote this logic it "worked on my machine".
The
((construct returns a 0 exit code if the value is non-zero. Since the value starts at 0 and we do a post-increment, it will always fail the first time. Changing it to a pre-increment fixes the problem.RELEASE NOTES: n/a