fix typo return values

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/include/functions.sh b/include/functions.sh
index f2b6577..6702cb2 100644
--- a/include/functions.sh
+++ b/include/functions.sh
@@ -114,12 +114,12 @@
 
     latency=$(cat $dirpath/cpuinfo_transition_latency)
     if [ $? != 0 ]; then
-	return -1
+	return 1
     fi
 
     nrfreq=$(cat $dirpath/scaling_available_frequencies | wc -w)
     if [ $? != 0 ]; then
-	return -1
+	return 1
     fi
 
     nrfreq=$((nrfreq + 1))