dmstyle: Another NULL ptr check added (Coverity).

dlls/dmstyle/style.c

@@ -500,7 +500,7 @@ static HRESULT IDirectMusicStyle8Impl_IPersistStream_ParsePartRefList (LPPERSIST
     case DMUS_FOURCC_PARTREF_CHUNK: {
       TRACE_(dmfile)(": PartRef chunk\n");
       pNewItem = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, sizeof(DMUS_PRIVATE_STYLE_PARTREF_ITEM));
-      if (NULL == pNewItem) {
+      if (!pNewItem) {
 	ERR(": no more memory\n");
 	return E_OUTOFMEMORY;
       }
@@ -523,6 +523,10 @@ static HRESULT IDirectMusicStyle8Impl_IPersistStream_ParsePartRefList (LPPERSIST
 	  ListCount[1] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
           TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
 	  
+          if (!pNewItem) {
+	    ERR(": pNewItem not yet allocated, chunk order bad?\n");
+	    return E_OUTOFMEMORY;
+          }
 	  hr = IDirectMusicUtils_IPersistStream_ParseUNFOGeneric(&Chunk, pStm, &pNewItem->desc);
 	  if (FAILED(hr)) return hr;