statpitcher: convert values from hex

In reference to https://buganizer.corp.google.com/issues/32948199

Change-Id: Ib9fb9b3a8ecb43663e5656424164a3d6ef493eea
diff --git a/cmds/statpitcher.cc b/cmds/statpitcher.cc
index 0a19443..27dd171 100644
--- a/cmds/statpitcher.cc
+++ b/cmds/statpitcher.cc
@@ -173,7 +173,7 @@
   if (pipe) {
     char buffer[128];
     if (fgets(buffer, 128, pipe.get()) != NULL) {
-      std::istringstream(buffer) >> ret;
+      std::istringstream(buffer) >> std::hex >> ret;
     }
   }
   return ret;