Fix a bug in dvmQuasiAtomicsShutdown.

Spotted visually when merging to an internal branch.

Change-Id: Ic130608bfa46036cec0684cd50706178cfefd2a0
diff --git a/vm/Atomic.cpp b/vm/Atomic.cpp
index 2bdca2b..4d376cf 100644
--- a/vm/Atomic.cpp
+++ b/vm/Atomic.cpp
@@ -183,7 +183,7 @@
 void dvmQuasiAtomicsShutdown() {
     for (size_t i = 0; i < kSwapLockCount; ++i) {
         pthread_mutex_t* m = gSwapLocks[i];
-        gSwapLocks[kSwapLockCount] = NULL;
+        gSwapLocks[i] = NULL;
         dvmDestroyMutex(m);
         delete m;
     }