Fix remaining pointer leaks in Asset.cpp

Follow up from comment in ag/6761240

Test: none

Change-Id: Ib6a52b3fe13b4eb00b363ee720196fe0bfdfbb94
diff --git a/libs/androidfw/Asset.cpp b/libs/androidfw/Asset.cpp
index 9a95fdf..92125c9 100644
--- a/libs/androidfw/Asset.cpp
+++ b/libs/androidfw/Asset.cpp
@@ -253,8 +253,10 @@
 
     pAsset = new _FileAsset;
     result = pAsset->openChunk(NULL, fd, offset, length);
-    if (result != NO_ERROR)
+    if (result != NO_ERROR) {
+        delete pAsset;
         return NULL;
+    }
 
     pAsset->mAccessMode = mode;
     return pAsset;
@@ -273,8 +275,10 @@
     pAsset = new _CompressedAsset;
     result = pAsset->openChunk(fd, offset, compressionMethod,
                 uncompressedLen, compressedLen);
-    if (result != NO_ERROR)
+    if (result != NO_ERROR) {
+        delete pAsset;
         return NULL;
+    }
 
     pAsset->mAccessMode = mode;
     return pAsset;
@@ -328,8 +332,10 @@
 
     pAsset = new _CompressedAsset;
     result = pAsset->openChunk(dataMap, uncompressedLen);
-    if (result != NO_ERROR)
+    if (result != NO_ERROR) {
+        delete pAsset;
         return NULL;
+    }
 
     pAsset->mAccessMode = mode;
     return pAsset;