Fix build break with uninitialized boost_fd.

Change-Id: Icf209e2e0f4835db01f61dbf83b4715db9ef03a9
diff --git a/libcutils/sched_policy.c b/libcutils/sched_policy.c
index e89998a..5853fbd 100644
--- a/libcutils/sched_policy.c
+++ b/libcutils/sched_policy.c
@@ -264,8 +264,8 @@
     policy = _policy(policy);
     pthread_once(&the_once, __initialize);
 
-    int fd;
-    int boost_fd;
+    int fd = -1;
+    int boost_fd = -1;
     switch (policy) {
     case SP_BACKGROUND:
         fd = bg_cpuset_fd;