ContextHub: Avoid reference leaks

The ContextHub HAL was leaking references in passOnOsResponse. An
example of this is when a sensor hub reset occurs. If many of these
resets happen, the local reference pool is exhausted and a crash
in the HAL occurs.

Bug: 30706325
Change-Id: Ica5328137a7033f512d7fb1ccf6fa138eab55091
(cherry picked from commit 52dda59896)

core/jni/android_hardware_location_ContextHubService.cpp

@@ -603,6 +603,8 @@ static void passOnOsResponse(uint32_t hubHandle, uint32_t msgType,
     env->CallIntMethod(db.jniInfo.jContextHubService,
                        db.jniInfo.contextHubServiceMsgReceiptCallback,
                        jheader, jmsg);
+    env->DeleteLocalRef(jmsg);
+    env->DeleteLocalRef(jheader);
 
     delete[] msg;
 }