Qbs: Fix build after build step factory changes

Change-Id: I1706bb886cdf224be6c81f212201ff317b7912e6
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/qbsprojectmanager/qbsbuildstep.cpp

@@ -697,13 +697,14 @@ QbsBuildStepFactory::QbsBuildStepFactory(QObject *parent) :
     ProjectExplorer::IBuildStepFactory(parent)
 { }
 
-void QbsBuildStepFactory::availableSteps(QList<ProjectExplorer::BuildStepInfo> *steps,
-                                                 ProjectExplorer::BuildStepList *parent) const
+QList<ProjectExplorer::BuildStepInfo> QbsBuildStepFactory::availableSteps(ProjectExplorer::BuildStepList *parent) const
 {
     if (parent->id() == ProjectExplorer::Constants::BUILDSTEPS_BUILD
             && qobject_cast<QbsBuildConfiguration *>(parent->parent())
             && qobject_cast<QbsProject *>(parent->target()->project()))
-        steps->append({ Constants::QBS_BUILDSTEP_ID, tr("Qbs Build") });
+       return {{ Constants::QBS_BUILDSTEP_ID, tr("Qbs Build") }};
+
+    return {};
 }
 
 ProjectExplorer::BuildStep *QbsBuildStepFactory::create(ProjectExplorer::BuildStepList *parent, Core::Id id)

src/plugins/qbsprojectmanager/qbscleanstep.cpp

@@ -300,12 +300,12 @@ QbsCleanStepFactory::QbsCleanStepFactory(QObject *parent) :
     ProjectExplorer::IBuildStepFactory(parent)
 { }
 
-void QbsCleanStepFactory::availableSteps(QList<ProjectExplorer::BuildStepInfo> *steps,
-                                              ProjectExplorer::BuildStepList *parent) const
+QList<ProjectExplorer::BuildStepInfo> QbsCleanStepFactory::availableSteps(ProjectExplorer::BuildStepList *parent) const
 {
     if (parent->id() == ProjectExplorer::Constants::BUILDSTEPS_CLEAN
             && qobject_cast<QbsBuildConfiguration *>(parent->parent()))
-        steps->append({ Constants::QBS_CLEANSTEP_ID, tr("Qbs Clean") });
+        return {{ Constants::QBS_CLEANSTEP_ID, tr("Qbs Clean") }};
+    return {};
 }
 
 ProjectExplorer::BuildStep *QbsCleanStepFactory::create(ProjectExplorer::BuildStepList *parent, Core::Id id)

src/plugins/qbsprojectmanager/qbsinstallstep.cpp

@@ -356,13 +356,13 @@ QbsInstallStepFactory::QbsInstallStepFactory(QObject *parent) :
     ProjectExplorer::IBuildStepFactory(parent)
 { }
 
-void QbsInstallStepFactory::availableSteps(QList<ProjectExplorer::BuildStepInfo> *steps,
-                                                ProjectExplorer::BuildStepList *parent) const
+QList<ProjectExplorer::BuildStepInfo> QbsInstallStepFactory::availableSteps(ProjectExplorer::BuildStepList *parent) const
 {
     if (parent->id() == ProjectExplorer::Constants::BUILDSTEPS_DEPLOY
             && qobject_cast<ProjectExplorer::DeployConfiguration *>(parent->parent())
             && qobject_cast<QbsProject *>(parent->target()->project()))
-        steps->append({ Constants::QBS_INSTALLSTEP_ID, tr("Qbs Install") });
+        return {{ Constants::QBS_INSTALLSTEP_ID, tr("Qbs Install") }};
+    return {};
 }
 
 ProjectExplorer::BuildStep *QbsInstallStepFactory::create(ProjectExplorer::BuildStepList *parent,