pm-qa: thermal: let tests return if heater program cannot be launched

If the heater program for heating CPU cannot be launched for some reason, the
tests should return right now, it is wasting time to execute all the rest parts
without heater program.

Signed-off-by: Hongbo Zhang <hongbo.zhang@linaro.org>
diff --git a/thermal/thermal_06.sh b/thermal/thermal_06.sh
index 0084281..b0a9442 100755
--- a/thermal/thermal_06.sh
+++ b/thermal/thermal_06.sh
@@ -60,6 +60,7 @@
     cpu_pid=$(ps | grep heat_cpu| awk '{print $1}')
     test -z $cpu_pid && cpu_pid=0
     check "start cpu heat binary" "test $cpu_pid -ne 0"
+    test $cpu_pid -eq 0 && return
 
     start_glmark2