Grass plugin/provider fixes for Coverity

Author: nyalldawson

src/plugins/grass/qgsgrassmodule.h

@@ -343,9 +343,6 @@ class QgsGrassModuleStandardOptions: QWidget, public QgsGrassModuleOptions
     //! List of all flags. Necessary for scripts.
     QStringList mFlagNames;
 
-    //! Use of region defined in qgm
-    bool mUsesRegion;
-
     // ! Advanced options switch button
     QPushButton mAdvancedPushButton;
 

src/providers/grass/qgsgrassprovider.cpp

@@ -78,6 +78,9 @@ static QString GRASS_DESCRIPTION = "Grass provider"; // XXX verify this
 
 QgsGrassProvider::QgsGrassProvider( QString uri )
     : QgsVectorDataProvider( uri )
+    , mLayerField( -1 )
+    , mLayerType( POINT )
+    , mGrassType( 0 )
     , mQgisType( QGis::WKBUnknown )
     , mLayerId( -1 )
     , mMap()
@@ -119,7 +122,6 @@ QgsGrassProvider::QgsGrassProvider( QString uri )
   /* Parse Layer, supported layers <field>_point, <field>_line, <field>_area
   *  Layer is opened even if it is empty (has no features)
   */
-  mLayerField = -1;
   if ( mLayer.compare( "boundary" ) == 0 ) // currently not used
   {
     mLayerType = BOUNDARY;

src/providers/grass/qgsgrassrasterprovider.cpp

@@ -142,10 +142,11 @@ QgsGrassRasterProvider::QgsGrassRasterProvider( QString const & uri )
   // We have to decide some reasonable block size, not to big to occupate too much
   // memory, not too small to result in too many calls to readBlock -> qgis.d.rast
   // for statistics
-  if ( mCols > 0 )
+  int typeSize = dataTypeSize( dataType( 1 ) );
+  if ( mCols > 0 && typeSize > 0 )
   {
     const int cache_size = 10000000; // ~ 10 MB
-    mYBlockSize = cache_size / ( dataTypeSize( dataType( 1 ) ) ) / mCols;
+    mYBlockSize = cache_size / typeSize / mCols;
     if ( mYBlockSize > mRows )
     {
       mYBlockSize = mRows;