Remove the unused loop counter in printSpeed

[galekseev]

Summary

printSpeed keeps a loop counter that nothing reads, and clang warns about it on every build:

Dispatcher.cpp:547:16: warning: variable 'i' set but not used [-Wunused-but-set-variable]

The counter is a leftover. It was introduced in 89ed68c (2018-03-11) and was read at the time, supplying the GPU label via toString(i). The very next day e46719d switched that to toString(e->m_index) so the printed index would match the device index rather than the vector position, but left the counter and its increment behind. Nothing has read it since.

gcc does not report this even with -Wall -Wextra, because it treats ++i as a read of i. clang follows the def-use chain and sees the value never escapes, which is why the warning only shows up on macOS builds, where g++ is clang.

Test plan

• Dispatcher.o is byte-identical before and after, in both the release and the PROFANITY_DEBUG configuration, so the compiler was already discarding the counter
• CI builds the image

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