perf tools: Remove a pointless check

perf tools: Remove a pointless check

Static analyser cppcheck says:

  linux-6.16/tools/perf/util/tool_pmu.c:242:15: warning:
      Opposite inner 'if' condition leads to a dead code block. [oppositeInnerCondition]

Source code is:

        for (thread = 0; thread < nthreads; thread++) {
            if (thread >= nthreads)
                break;

Reported-by: David Binderman <dcb314@hotmail.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>