Fix Gradle plugin publishing credentials check

Author: dreab8

tooling/hibernate-gradle-plugin/hibernate-gradle-plugin.gradle

@@ -178,12 +178,12 @@ gradle.taskGraph.whenReady { tg ->
 // and then the `gradle.publish.key` / `gradle.publish.secret` combo (project prop)
 //- see https://docs.gradle.org/current/userguide/publishing_gradle_plugins.html#account_setup
 if ( System.getenv().get("GRADLE_PUBLISH_KEY") != null ) {
-if ( System.getenv().get("GRADLE_PUBLISH_SECRET") != null ) {
+if ( System.getenv().get("GRADLE_PUBLISH_SECRET") == null ) {
 throw new RuntimeException( "`GRADLE_PUBLISH_KEY` specified, but not `GRADLE_PUBLISH_SECRET` for publishing Gradle plugin" )
 }
 }
 else if ( project.findProperty( 'gradle.publish.key' ) != null ) {
-if ( project.findProperty( 'gradle.publish.secret' ) != null ) {
+if ( project.findProperty( 'gradle.publish.secret' ) == null ) {
 throw new RuntimeException( "`gradle.publish.key` specified, but not `gradle.publish.secret` for publishing Gradle plugin" )
 }
 }