app/trace_record: modify help case to return 0

Case 'h' or 'H' should return 0, this is a normal return.

Change-Id: I872cdeeaab8bbe0efac8a8f959c1bd88f159b0b8
Signed-off-by: wanghailiangx <hailiangx.e.wang@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6064
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Xiaodong Liu <xiaodong.liu@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>

app/trace_record/trace_record.c

@@ -613,6 +613,8 @@ int main(int argc, char **argv)
 			file_name = optarg;
 			break;
 		case 'h':
+			usage();
+			exit(EXIT_SUCCESS);
 		default:
 			usage();
 			exit(1);