ProjectExplorer: Remove SysRootKitInformation::hasSysRoot()

This function is exactly the same as SysrootKitInformation::sysroot(),
except that is returns a boolean. And it's always used like this:
if (SysRootKitInformation::hasSysRoot(k))
    sysroot = SysRootKitInformation::SysrootKitInformation::sysroot(k);
Which means that the same code is executed twice in a row.
There is no point in this, so let's just remove it.

Change-Id: I95e4de101d6164ed48558b888e22ed8892fc6d9b
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/perfprofiler/perfprofilertool.cpp

@@ -551,9 +551,7 @@ static Utils::FileNameList collectQtIncludePaths(const ProjectExplorer::Kit *kit
 
 static Utils::FileName sysroot(const Kit *kit)
 {
-    if (kit && SysRootKitInformation::hasSysRoot(kit))
-        return SysRootKitInformation::sysRoot(kit);
-    return Utils::FileName();
+    return SysRootKitInformation::sysRoot(kit);
 }
 
 static Utils::FileNameList sourceFiles(const Project *currentProject = nullptr)

src/plugins/projectexplorer/kitinformation.cpp

@@ -117,13 +117,6 @@ Core::Id SysRootKitInformation::id()
     return "PE.Profile.SysRoot";
 }
 
-bool SysRootKitInformation::hasSysRoot(const Kit *k)
-{
-    if (k)
-        return !k->value(SysRootKitInformation::id()).toString().isEmpty();
-    return false;
-}
-
 Utils::FileName SysRootKitInformation::sysRoot(const Kit *k)
 {
     if (!k)

src/plugins/projectexplorer/kitinformation.h

@@ -60,7 +60,6 @@ public:
     void addToMacroExpander(Kit *kit, Utils::MacroExpander *expander) const override;
 
     static Core::Id id();
-    static bool hasSysRoot(const Kit *k);
     static Utils::FileName sysRoot(const Kit *k);
     static void setSysRoot(Kit *k, const Utils::FileName &v);
 };

src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp

@@ -223,7 +223,7 @@ QVariantMap DefaultPropertyProvider::autoGeneratedProperties(const ProjectExplor
     QVariantMap data = defaultData;
 
     const QString sysroot = ProjectExplorer::SysRootKitInformation::sysRoot(k).toUserOutput();
-    if (ProjectExplorer::SysRootKitInformation::hasSysRoot(k))
+    if (!sysroot.isEmpty())
         data.insert(QLatin1String(QBS_SYSROOT), sysroot);
 
     ProjectExplorer::ToolChain *tcC

src/plugins/qmakeprojectmanager/qmakeproject.cpp

@@ -684,8 +684,7 @@ QtSupport::ProFileReader *QmakeProject::createProFileReader(const QmakeProFile *
         }
 
         QtSupport::BaseQtVersion *qtVersion = QtSupport::QtKitInformation::qtVersion(k);
-        m_qmakeSysroot = SysRootKitInformation::hasSysRoot(k)
-                ? SysRootKitInformation::sysRoot(k).toString() : QString();
+        m_qmakeSysroot = SysRootKitInformation::sysRoot(k).toString();
 
         if (qtVersion && qtVersion->isValid()) {
             m_qmakeGlobals->qmake_abslocation = QDir::cleanPath(qtVersion->qmakeCommand().toString());

src/plugins/remotelinux/deploymenttimeinfo.cpp

@@ -88,9 +88,7 @@ public:
         QString host;
 
         if (kit) {
-            if (SysRootKitInformation::hasSysRoot(kit))
-                systemRoot = SysRootKitInformation::sysRoot(kit).toString();
-
+            systemRoot = SysRootKitInformation::sysRoot(kit).toString();
             const IDevice::ConstPtr deviceConfiguration = DeviceKitInformation::device(kit);
             host = deviceConfiguration->sshParameters().host();
         }