Format error in our pipeline patch

I was building tor-browser.git with --enable-debug and -Werror=format and it revealed a format error in our #5282 (closed) patch. The line is

      fprintf(stderr, "WTF-combine: Sent %lld/%lld bytes of %lld combined pipelined requests for host %s\n",
              alreadyPending+totalSent, totalAvailable, reqsSent, ci->Origin());

But the first three arguments after the format string are unsigned long integers, not long long integers.

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