perf dlfilter: Drop unused variable

Compiling tools/perf/dlfilters/dlfilter-test-api-v0.c result in:

checking for stdlib.h... dlfilters/dlfilter-test-api-v0.c: In function ‘filter_event’:
dlfilters/dlfilter-test-api-v0.c:311:29: warning: unused variable ‘d’ [-Wunused-variable]
311 | struct filter_data *d = data;
|

So remove the variable now.

Reviewed-by: German Gomez <[e-mail]>
Signed-off-by: Salvatore Bonaccorso <[e-mail]>
Acked-by: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/dlfilters/dlfilter-test-api-v0.c

···
 
 int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx)
 {
-	struct filter_data *d = data;
-
 	pr_debug("%s API\n", __func__);
 
 	return do_checks(data, sample, ctx, false);