UBUNTU: SAUCE: selftests/ftrace: Fix tab expansion in trace_marker snapshot trigger test

When trace lines are passed through echo tabs are being changed
to spaces, causing later string comparisons to fail. Add quotes
around the variables to prevent this.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-snapshot.tc

@@ -14,12 +14,12 @@ test_trace() {
     x=$2
 
     cat $file | while read line; do
-	comment=`echo $line | sed -e 's/^#//'`
+	comment=`echo "$line" | sed -e 's/^#//'`
 	if [ "$line" != "$comment" ]; then
 	    continue
 	fi
 	echo "testing $line for >$x<"
-	match=`echo $line | sed -e "s/>$x<//"`
+	match=`echo "$line" | sed -e "s/>$x<//"`
 	if [ "$line" = "$match" ]; then
 	    fail "$line does not have >$x< in it"
 	fi