Add safe FX_Alloc2D() macro

core/src/fxge/agg/agg23/fx_agg_path_storage.cpp

Index: core/src/fxge/agg/agg23/fx_agg_path_storage.cpp
diff --git a/core/src/fxge/agg/agg23/fx_agg_path_storage.cpp b/core/src/fxge/agg/agg23/fx_agg_path_storage.cpp
index 8c4b701ebe349038b3555f271732f87bc3d59cd4..b4b184e0a4abcc859574dff1afc67c1490b26248 100644
--- a/core/src/fxge/agg/agg23/fx_agg_path_storage.cpp
+++ b/core/src/fxge/agg/agg23/fx_agg_path_storage.cpp
@@ -51,10 +51,7 @@ void path_storage::allocate_block(unsigned nb)
 {
     if(nb >= m_max_blocks) {
         FX_FLOAT** new_coords =
-            FX_Alloc( FX_FLOAT*, (m_max_blocks + block_pool) * 2);
-        if (!new_coords) {
-            return;
-        }
+            FX_Alloc2D(FX_FLOAT*, m_max_blocks + block_pool, 2);
         unsigned char** new_cmds =
             (unsigned char**)(new_coords + m_max_blocks + block_pool);
         if(m_coord_blocks) {