selftests/bpf: Use producer_cnt to allocate local counter array

For count-local benchmark, use producer_cnt instead of consumer_cnt when
allocating local counter array.

Signed-off-by: Hou Tao <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexei Starovoitov <[e-mail]>

tools/testing/selftests/bpf/benchs/bench_count.c

···
 {
 	struct count_local_ctx *ctx = &count_local_ctx;
 
-	ctx->hits = calloc(env.consumer_cnt, sizeof(*ctx->hits));
+	ctx->hits = calloc(env.producer_cnt, sizeof(*ctx->hits));
 	if (!ctx->hits)
 		exit(1);
 }