QDeclarativeTextEdit: fix use of uninitialised value.

Detected by valgrind:
==27068== Conditional jump or move depends on uninitialised value(s)
==27068==    at 0x70C7289: QDeclarativeTextEdit::updateTotalLines() (qdeclarativetextedit.cpp:1742)

Backport from qtquick1

Change-Id: Iafc0c0072e6ab318fd4643e8ac7531edf5ec7ad0
Reviewed-by: Simon Hausmann <[email protected]>

Author: dfaure-kdab

src/declarative/graphicsitems/qdeclarativetextedit_p_p.h

@@ -73,7 +73,7 @@ class QDeclarativeTextEditPrivate : public QDeclarativeImplicitSizePaintedItemPr
       showInputPanelOnFocus(true), clickCausedFocus(false), persistentSelection(true), requireImplicitWidth(false),
       hAlignImplicit(true), rightToLeftText(false), textMargin(0.0), lastSelectionStart(0), lastSelectionEnd(0),
       cursorComponent(0), cursor(0), format(QDeclarativeTextEdit::AutoText), document(0), wrapMode(QDeclarativeTextEdit::NoWrap),
-      mouseSelectionMode(QDeclarativeTextEdit::SelectCharacters), selectByMouse(false), canPaste(false),
+      mouseSelectionMode(QDeclarativeTextEdit::SelectCharacters), lineCount(0), selectByMouse(false), canPaste(false),
       yoff(0)
     {
 #ifdef Q_OS_SYMBIAN