Compiler warnings fixes.
diff --git a/zebra/zebra_vty.c b/zebra/zebra_vty.c
index 4bcd29f..b2f0932 100644
--- a/zebra/zebra_vty.c
+++ b/zebra/zebra_vty.c
@@ -59,7 +59,7 @@
 };
 
 /* Return route type string for VTY output.  */
-const char
+char
 route_type_char (u_char type)
 {
   switch (type)