Use memset to initialize dynamic array.

clang/llvm rejects
  int32_t events[len] = {};.

BUG: 21269094
Change-Id: I0257bfbb72f1b49913baba0164d5a3a7976c452d
diff --git a/camera/ICameraService.cpp b/camera/ICameraService.cpp
index a02dbe2..0071e70 100644
--- a/camera/ICameraService.cpp
+++ b/camera/ICameraService.cpp
@@ -494,7 +494,8 @@
                         __FUNCTION__, len);
                 return FAILED_TRANSACTION;
             }
-            int32_t events[len] = {};
+            int32_t events[len];
+            memset(events, 0, sizeof(int32_t) * len);
             status_t status = data.read(events, sizeof(int32_t) * len);
             if (status != NO_ERROR) {
                 ALOGE("%s: Received poorly formatted binder request: notifySystemEvent.",