Delete pAsset* when failing to open chunk from FileAsset

Realistically this doesn't matter because FileAsset always returns
NO_ERROR. But it's worth being correct, in case that ever changes.

Bug: 112146313

Test: none necessary

Change-Id: Iaeddc77c78c93394f96b77533cf8ce30cd1dc370
diff --git a/libs/androidfw/Asset.cpp b/libs/androidfw/Asset.cpp
index c512a6b..9a95fdf 100644
--- a/libs/androidfw/Asset.cpp
+++ b/libs/androidfw/Asset.cpp
@@ -292,8 +292,10 @@
 
     pAsset = new _FileAsset;
     result = pAsset->openChunk(dataMap);
-    if (result != NO_ERROR)
+    if (result != NO_ERROR) {
+        delete pAsset;
         return NULL;
+    }
 
     pAsset->mAccessMode = mode;
     return pAsset;