Fix wrong variable name

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/vorner-recursor-dummylog@3360 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/log/dummylog.h

@@ -28,7 +28,7 @@ extern bool denabled;
  * The prefix is printed in front of every log message in square brackets.
  * The usual convention is to put the name of program here.
  */
-extern std::string dprogram;
+extern std::string dprefix;
 
 /**
  * \short Temporary interface to logging.