perf lock contention: Fix a build error on 32-bit

perf lock contention: Fix a build error on 32-bit

It was reported that it failed to build the BPF lock contention skeleton
on 32 bit arch due to the size of long.  The lost count is used only for
reporting errors due to lack of stackmap space through bad_hist which
type is 'int'.  Let's use int type then.

Fixes: 6d499a6b3d90277d ("perf lock: Print the number of lost entries for BPF")
Reported-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Link: http://lore.kernel.org/lkml/20220926215638.3931222-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>