Add '\n' at the end of traces.

diff --git a/msdos/ioports.c b/msdos/ioports.c
index b43bfde..18a73cf 100644
--- a/msdos/ioports.c
+++ b/msdos/ioports.c
@@ -95,7 +95,7 @@
             Dosvm.SetTimer(maxval);
             break;
         case 1: /* RAM refresh */
-            FIXME("RAM refresh counter handling not implemented !");
+            FIXME("RAM refresh counter handling not implemented !\n");
             break;
         case 2: /* cassette & speaker */
             /* speaker on ? */