perf test: test_intel_pt.sh: Use grep -c instead of grep plus wc -l

perf test: test_intel_pt.sh: Use grep -c instead of grep plus wc -l

As suggested by shellcheck, use grep -c instead of grep plus wc -l

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220912083412.7058-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>