[sysprof] build: let gcc know our cast is safe

[Christian Hergert <chergert src gnome org>]

commit 8709eaff1402207ad369c2a0c97daf1ffc3e9286
Author: Christian Hergert <chergert redhat com>
Date:   Wed Apr 20 22:35:17 2016 -0700

    build: let gcc know our cast is safe
    
    Data is already aligned, so casting the ->data field is fine.

 lib/sp-callgraph-profile.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/lib/sp-callgraph-profile.c b/lib/sp-callgraph-profile.c
index 996c53e..54e0a27 100644
--- a/lib/sp-callgraph-profile.c
+++ b/lib/sp-callgraph-profile.c
@@ -304,7 +304,7 @@ sp_callgraph_profile_generate_worker (GTask        *task,
 
       g_array_index (resolved, guint64, len++) = POINTER_TO_U64 ("[Everything]");
 
-      stack_stash_add_trace (resolved_stash, (SpAddress *)resolved->data, len, 1);
+      stack_stash_add_trace (resolved_stash, (SpAddress *)(gpointer)resolved->data, len, 1);
     }
 
   ret = TRUE;