[gnome-commander/ConvertWarningsToErrors] Fix for gcc string assignment warning

[Uwe Scholz <uwescholz src gnome org>]

commit d0b3a8e2d6e261a638f733dcb48222f4d3b3ca10
Author: Uwe Scholz <uwescholz src gnome org>
Date:   Tue Apr 18 22:20:56 2017 +0200

    Fix for gcc string assignment warning

 src/utils.cc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/utils.cc b/src/utils.cc
index 4528c4a..fcb073b 100644
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -381,7 +381,7 @@ const gchar *size2string (GnomeVFSFileSize size, GnomeCmdSizeDispMode size_disp_
                 if (len < 5)
                     return buf0;
 
-                gchar *sep = " ";
+                gchar *sep = (gchar*) " ";
 
                 gchar *src  = buf0;
                 gchar *dest = buf1;