client: fix error in logging output

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/client.c b/client.c
index f915464..dfc172e 100644
--- a/client.c
+++ b/client.c
@@ -133,7 +133,7 @@
 			free(cmd);
 			continue;
 		}
-		printf("%s", cmd->payload);
+		fwrite(cmd->payload, cmd->pdu_len, 1, stdout);
 		fflush(stdout);
 		free(cmd);
 	}