[FIXED HUDSON-2594] Fixed authentication so that login successfully after signing up

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@13061 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/security/HudsonPrivateSecurityRealm.java

@@ -280,7 +280,7 @@ public class HudsonPrivateSecurityRealm extends SecurityRealm implements ModelOb
         }
 
         /*package*/ Authentication createAuthentication() {
-            return new UsernamePasswordAuthenticationToken(null, password);
+            return new UsernamePasswordAuthenticationToken(getUsername(), getPassword());
         }
     }