Remove trailing whitespaces in regular file

Change-Id: I5faf840dd6649afcb53e91f1d033447f9729cee1
diff --git a/tools/build_uec.sh b/tools/build_uec.sh
index ed5a017..35a4d6d 100755
--- a/tools/build_uec.sh
+++ b/tools/build_uec.sh
@@ -147,7 +147,7 @@
     <interface type='network'>
       <source network='$NET_NAME'/>
     </interface>
-        
+
     <!-- The order is significant here.  File must be defined first -->
     <serial type="file">
       <source path='$vm_dir/console.log'/>