Use cached values for resizing volume groups.

src/core/device.h

@@ -64,6 +64,10 @@ public:
     virtual bool operator==(const Device& other) const;
     virtual bool operator!=(const Device& other) const;
 
+    virtual QString& name() {
+        return m_Name;    /**< @return the Device's name, usually some manufacturer string */
+    }
+
     virtual const QString& name() const {
         return m_Name;    /**< @return the Device's name, usually some manufacturer string */
     }

src/ops/resizevolumegroupoperation.cpp

@@ -78,8 +78,9 @@ ResizeVolumeGroupOperation::ResizeVolumeGroupOperation(LvmDevice& d, const QList
         movePE += lvm2PVFs->allocatedPE();
     }
     qint64 growPE = 0;
-    for (const auto &p : toInsertList) // FIXME: qAsConst
-        growPE += p->capacity() / LvmDevice::getPeSize(d.name());
+    for (const auto &p : toInsertList) { // FIXME: qAsConst
+        growPE += p->capacity() / device().peSize();
+    }
 
     if ( movePE > (freePE + growPE)) {
         // *ABORT* can't move

src/util/externalcommand.cpp

@@ -20,8 +20,6 @@
 
 #include "util/report.h"
 
-#include <cstdlib>
-
 #include <QString>
 #include <QStringList>