os: print newline after printing display name

Much easier for scripts that try to read the display value off the file
descriptor. Plus, this restores the behaviour we had for this patch in
Fedora since server 1.6 (April 2009).

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Chase Douglas <chase.douglas@canonical.com>

os/connection.c

@@ -353,6 +353,7 @@ NotifyParentProcess(void)
 #if !defined(WIN32)
     if (dynamic_display[0]) {
         write(displayfd, dynamic_display, strlen(dynamic_display));
+        write(displayfd, "\n", 1);
         close(displayfd);
     }
     if (RunFromSmartParent) {