Fix for BUG#1258 (Trying to use the mysqlbinlog with -h and -u option gives segmentation

fault). Fix is just initializing "host" (and "user") with 0, not a string.

client/mysqlbinlog.cc

@@ -49,10 +49,10 @@ static bool force_opt= 0;
 static const char* database;
 static bool short_form = 0;
 static ulonglong offset = 0;
-static const char* host = "localhost";
+static const char* host = 0;
 static int port = MYSQL_PORT;
 static const char* sock= MYSQL_UNIX_ADDR;
-static const char* user = "test";
+static const char* user = 0;
 static const char* pass = "";
 static ulonglong position = 0;
 static bool use_remote = 0;