[gtksourceview] snippets: use local instead of cast

[Christian Hergert <chergert src gnome org>]

commit aed8c825d658c4b69387a4c28228100f0f9cf4d4
Author: Christian Hergert <chergert redhat com>
Date:   Fri Nov 6 10:33:38 2020 -0800

    snippets: use local instead of cast

 .../completion-providers/snippets/gtksourcecompletionsnippets.c         | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtksourceview/completion-providers/snippets/gtksourcecompletionsnippets.c 
b/gtksourceview/completion-providers/snippets/gtksourcecompletionsnippets.c
index 345d2a73..1edb022f 100644
--- a/gtksourceview/completion-providers/snippets/gtksourcecompletionsnippets.c
+++ b/gtksourceview/completion-providers/snippets/gtksourcecompletionsnippets.c
@@ -243,7 +243,7 @@ gtk_source_completion_snippets_activate (GtkSourceCompletionProvider *provider,
                GtkSourceView *view = gtk_source_completion_context_get_view (context);
                GtkSourceSnippet *snippet, *copy;
 
-               snippet = gtk_source_completion_snippets_proposal_get_snippet 
(GTK_SOURCE_COMPLETION_SNIPPETS_PROPOSAL (proposal));
+               snippet = gtk_source_completion_snippets_proposal_get_snippet (p);
                copy = gtk_source_snippet_copy (snippet);
 
                gtk_text_buffer_begin_user_action (GTK_TEXT_BUFFER (buffer));