Quote GRML_FAI_CONFIG in warning message since its unset

diff --git a/grml-live b/grml-live
index 88d796f..828acfa 100755 (executable)
--- a/grml-live
+++ b/grml-live
@@ -293,7 +293,7 @@ fi
 
 if [ -n "${GRML_LIVE_SOURCES:-}" ] ; then
   eerror "Config variable \$GRML_LIVE_SOURCES is set. This variable has been deprecated."
-  ewarn  "Please set up ${GRML_FAI_CONFIG}/config/files/etc/apt/sources.list.d/* instead."
+  ewarn  "Please set up \${GRML_FAI_CONFIG}/config/files/etc/apt/sources.list.d/* instead."
   bailout 1
 fi
 # }}}