mesa: modified _mesa_align_free() to accept NULL pointer

So that it acts like ordinary free().  This lets us remove a bunch of
if statements where the function is called.

v2:
- Avoiding compile error on MSVC and possible warnings on other compilers.
- Added comment regards passing NULL pointer being safe.

Reviewed-by: Brian Paul <brianp@vmware.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/src/mesa/vbo/vbo_exec_api.c b/src/mesa/vbo/vbo_exec_api.c
index c84d97f..6feda16 100644
--- a/src/mesa/vbo/vbo_exec_api.c
+++ b/src/mesa/vbo/vbo_exec_api.c
@@ -990,11 +990,10 @@ void vbo_use_buffer_objects(struct gl_context *ctx)
 
    /* Make sure this func is only used once */
    assert(exec->vtx.bufferobj == ctx->Shared->NullBufferObj);
-   if (exec->vtx.buffer_map) {
-      _mesa_align_free(exec->vtx.buffer_map);
-      exec->vtx.buffer_map = NULL;
-      exec->vtx.buffer_ptr = NULL;
-   }
+
+   _mesa_align_free(exec->vtx.buffer_map);
+   exec->vtx.buffer_map = NULL;
+   exec->vtx.buffer_ptr = NULL;
 
    /* Allocate a real buffer object now */
    _mesa_reference_buffer_object(ctx, &exec->vtx.bufferobj, NULL);