test/aer: modify help case to return 0

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

Change-Id: I09f81e08d782007c62592475750e70461c83f318
Signed-off-by: wanghailiangx <hailiangx.e.wang@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6194
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>

test/nvme/aer/aer.c

@@ -345,6 +345,8 @@ parse_args(int argc, char **argv)
 			g_enable_temp_test = 1;
 			break;
 		case 'H':
+			usage(argv[0]);
+			exit(EXIT_SUCCESS);
 		default:
 			usage(argv[0]);
 			return 1;