[beast] BST: fix passing std::string through varargs

[Tim Janik <timj src gnome org>]

commit 8cc27498b2d2a8a27b05a02a0ecdeb3d37600ea8
Author: Tim Janik <timj gnu org>
Date:   Sat Sep 2 03:26:31 2017 +0200

    BST: fix passing std::string through varargs
    
    Signed-off-by: Tim Janik <timj gnu org>

 beast-gtk/bstcanvassource.cc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/beast-gtk/bstcanvassource.cc b/beast-gtk/bstcanvassource.cc
index dce262f..b1e571f 100644
--- a/beast-gtk/bstcanvassource.cc
+++ b/beast-gtk/bstcanvassource.cc
@@ -743,7 +743,7 @@ bst_canvas_source_build_channels (BstCanvasSource *csource,
                                         "x", east_channel ? TOTAL_WIDTH (csource) + BORDER_PAD * 2. : 
-BORDER_PAD,
                                         "y", (y1 + y2) / 2.,
                                         "font", CHANNEL_FONT,
-                                        "text", csource->show_hints ? label : "",
+                                        "text", csource->show_hints ? label.c_str() : "",
                                         NULL);
           g_object_connect (item,
                             "swapped_signal::destroy", channel_name_remove, csource,