winegstreamer: Factor wm reader sample allocator error checks.

dlls/winegstreamer/wm_reader.c

@@ -1573,9 +1573,10 @@ HRESULT wm_reader_get_stream_sample(struct wm_reader *reader, IWMReaderCallbackA
     struct wg_parser_stream *wg_stream;
     struct wg_parser_buffer wg_buffer;
     struct wm_stream *stream;
+    struct buffer *object;
     DWORD size, capacity;
     INSSBuffer *sample;
-    HRESULT hr;
+    HRESULT hr = S_OK;
     BYTE *data;
 
     for (;;)
@@ -1620,36 +1621,16 @@ HRESULT wm_reader_get_stream_sample(struct wm_reader *reader, IWMReaderCallbackA
         TRACE("Got buffer for '%s' stream %p.\n", get_major_type_string(stream->format.major_type), stream);
 
         if (callback_advanced && stream->read_compressed && stream->allocate_stream)
-        {
-            if (FAILED(hr = IWMReaderCallbackAdvanced_AllocateForStream(callback_advanced,
-                    stream->index + 1, wg_buffer.size, &sample, NULL)))
-            {
-                ERR("Failed to allocate stream sample of %u bytes, hr %#lx.\n", wg_buffer.size, hr);
-                wg_parser_stream_release_buffer(wg_stream);
-                return hr;
-            }
-        }
+            hr = IWMReaderCallbackAdvanced_AllocateForStream(callback_advanced,
+                    stream->index + 1, wg_buffer.size, &sample, NULL);
         else if (callback_advanced && !stream->read_compressed && stream->allocate_output)
-        {
-            if (FAILED(hr = IWMReaderCallbackAdvanced_AllocateForOutput(callback_advanced,
-                    stream->index, wg_buffer.size, &sample, NULL)))
-            {
-                ERR("Failed to allocate output sample of %u bytes, hr %#lx.\n", wg_buffer.size, hr);
-                wg_parser_stream_release_buffer(wg_stream);
-                return hr;
-            }
-        }
+            hr = IWMReaderCallbackAdvanced_AllocateForOutput(callback_advanced,
+                    stream->index, wg_buffer.size, &sample, NULL);
+        /* FIXME: Should these be pooled? */
+        else if (!(object = calloc(1, offsetof(struct buffer, data[wg_buffer.size]))))
+            hr = E_OUTOFMEMORY;
         else
         {
-            struct buffer *object;
-
-            /* FIXME: Should these be pooled? */
-            if (!(object = calloc(1, offsetof(struct buffer, data[wg_buffer.size]))))
-            {
-                wg_parser_stream_release_buffer(wg_stream);
-                return E_OUTOFMEMORY;
-            }
-
             object->INSSBuffer_iface.lpVtbl = &buffer_vtbl;
             object->refcount = 1;
             object->capacity = wg_buffer.size;
@@ -1658,6 +1639,13 @@ HRESULT wm_reader_get_stream_sample(struct wm_reader *reader, IWMReaderCallbackA
             sample = &object->INSSBuffer_iface;
         }
 
+        if (FAILED(hr))
+        {
+            ERR("Failed to allocate sample of %u bytes, hr %#lx.\n", wg_buffer.size, hr);
+            wg_parser_stream_release_buffer(wg_stream);
+            return hr;
+        }
+
         if (FAILED(hr = INSSBuffer_GetBufferAndLength(sample, &data, &size)))
             ERR("Failed to get data pointer, hr %#lx.\n", hr);
         if (FAILED(hr = INSSBuffer_GetMaxLength(sample, &capacity)))