Fix crash in new profile

The gasPressureItem needs to be initialized to null in the constructor.

Signed-off-by: Michael Andreen <harv@ruin.nu>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/profile/profilewidget2.cpp

@@ -35,6 +35,7 @@ ProfileWidget2::ProfileWidget2(QWidget *parent) :
 	diveProfileItem(NULL),
 	cylinderPressureAxis(new DiveCartesianAxis()),
 	temperatureItem(NULL),
+	gasPressureItem(NULL),
 	cartesianPlane(new DiveCartesianPlane())
 {
 	setScene(new QGraphicsScene());