Arbitrary code cleanups

Just some stuff that piles up while "looking" at the code, which
eventually gets annoying to ignore while staging real changes.

* Replaced a few NULL occurrences with 0
* Rely on default parameter for std::vector::resize.
* Replaced a few "" with std::string()
* Prefer .empty() to == ""
* Removed a few comparisons with NULL
* Don't check pointers before deleting them
* Removed a bunch of redundant semicolons
* Made some global variables static (local to their compilation unit)
* Prefer prefix ++/-- operators to postfix versions when possible
* Corrected location of a comment

2 files changed, 4 insertions, 4 deletions

diff --git a/src/gui/widgets/listbox.cpp b/src/gui/widgets/listbox.cpp
index 570983ca..239f4784 100644
--- a/src/gui/widgets/listbox.cpp
+++ b/src/gui/widgets/listbox.cpp
@@ -118,8 +118,6 @@ void ListBox::keyPressed(gcn::KeyEvent& keyEvent)
     }
 }
 
-// Don't do anything on scrollwheel. ScrollArea will deal with that.
-
 void ListBox::mousePressed(gcn::MouseEvent &mouseEvent)
 {
     if (mouseEvent.getButton() != gcn::MouseEvent::LEFT)
@@ -134,10 +132,12 @@ void ListBox::mousePressed(gcn::MouseEvent &mouseEvent)
 
 void ListBox::mouseWheelMovedUp(gcn::MouseEvent &mouseEvent)
 {
+    // Don't do anything on scrollwheel. ScrollArea will deal with that.
 }
 
 void ListBox::mouseWheelMovedDown(gcn::MouseEvent &mouseEvent)
 {
+    // Don't do anything on scrollwheel. ScrollArea will deal with that.
 }
 
 void ListBox::mouseDragged(gcn::MouseEvent &event)
diff --git a/src/gui/widgets/tablemodel.cpp b/src/gui/widgets/tablemodel.cpp
index b4bbb409..477b35c0 100644
--- a/src/gui/widgets/tablemodel.cpp
+++ b/src/gui/widgets/tablemodel.cpp
@@ -56,7 +56,7 @@ StaticTableModel::StaticTableModel(int row, int column) :
     mColumns(column),
     mHeight(1)
 {
-    mTableModel.resize(row * column, NULL);
+    mTableModel.resize(row * column);
     mWidths.resize(column, 1);
 }
 
@@ -69,7 +69,7 @@ void StaticTableModel::resize()
 {
     mRows = getRows();
     mColumns = getColumns();
-    mTableModel.resize(mRows * mColumns, NULL);
+    mTableModel.resize(mRows * mColumns);
 }
 
 void StaticTableModel::set(int row, int column, gcn::Widget *widget)