dwrite: Initialize realloc'ed memory to zero.

dlls/dwrite/dwrite_private.h

@@ -34,6 +34,11 @@ static inline void *heap_realloc(void *mem, size_t len)
     return HeapReAlloc(GetProcessHeap(), 0, mem, len);
 }
 
+static inline void *heap_realloc_zero(void *mem, size_t len)
+{
+    return HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, mem, len);
+}
+
 static inline BOOL heap_free(void *mem)
 {
     return HeapFree(GetProcessHeap(), 0, mem);

dlls/dwrite/main.c

@@ -468,7 +468,7 @@ static HRESULT WINAPI dwritefactory_RegisterFontCollectionLoader(IDWriteFactory
         int new_count = 0;
 
         new_count = This->loader_count * 2;
-        new_list = heap_realloc(This->loaders, new_count * sizeof(*This->loaders));
+        new_list = heap_realloc_zero(This->loaders, new_count * sizeof(*This->loaders));
 
         if (!new_list)
             return E_OUTOFMEMORY;
@@ -603,7 +603,7 @@ static HRESULT WINAPI dwritefactory_RegisterFontFileLoader(IDWriteFactory *iface
         int new_count = 0;
 
         new_count = This->file_loader_count * 2;
-        new_list = heap_realloc(This->file_loaders, new_count * sizeof(*This->file_loaders));
+        new_list = heap_realloc_zero(This->file_loaders, new_count * sizeof(*This->file_loaders));
 
         if (!new_list)
             return E_OUTOFMEMORY;