little fix on ntlm settings. Thanks to Lukas.

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@373595 13f79535-47bb-0310-9956-ffa450edef68

linkcheck/src/main/org/apache/maven/plugin/linkcheck/validation/OnlineHTTPLinkValidator.java

@@ -78,7 +78,7 @@ public final class OnlineHTTPLinkValidator
             }
             this.proxyUser = proxyUser;
             this.proxyPass = proxyPass;
-            if ( proxyNtlmHost != null && proxyNtlmHost.trim().equals( "" ) )
+            if ( proxyNtlmHost != null && !proxyNtlmHost.trim().equals( "" ) )
             {
                 this.proxyNtlmHost = proxyNtlmHost;
                 this.proxyNtlmDomain = proxyNtlmDomain;