grml-screen: only chgrp if mkdir was successfull

diff --git a/usr_bin/grml-screen b/usr_bin/grml-screen
index d6413e0..91cedce 100755 (executable)
--- a/usr_bin/grml-screen
+++ b/usr_bin/grml-screen
@@ -17,8 +17,7 @@
 # try to mitigate raceconditions from screen
 SCREENDIR_="/var/run/screen"
 if [ `id -u` = 0 ] ; then
-    mkdir -m 755 $SCREENDIR_
-    chgrp utmp $SCREENDIR_
+    mkdir -m 755 $SCREENDIR_ &>/dev/null && chgrp utmp $SCREENDIR_
 fi
 mkdir -m 700 "${SCREENDIR_}/S-$USER" &>/dev/null