fixed a bug in bash script

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@7829 818b1a75-f10b-46b9-bf7c-635c3b92a50f

cmake_targets/tools/run_enb_ue_virt_noS1

@@ -199,7 +199,7 @@ function main()
   # ue1 -> enb
   $OPENAIR_DIR/targets/bin/rb_tool -a -c0 -i1 -z0 -s 10.0.2.2 -t 10.0.2.1 -r 1
 
-  if [ abstraction_flag -eq 0 ] ; then 
+  if [ "$abstraction_flag" -eq "0" ] ; then 
       exe_arguments="$exe_arguments -s15 -AAWGN -b1 -u1"
   else 
       exe_arguments="$exe_arguments -b1 -u1"