perf test: Replace 'grep | wc -l' with 'grep -c'

To count the number of results from grep, use the '-c' parameter
instead of piping it to 'wc'.

See also https://www.shellcheck.net/wiki/SC2126

Signed-off-by: Diederik de Haas <[email protected]>
Acked-by: Carsten Haitzler <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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