Fix some Coverity identified issues.

common/tool/picker_tool.cpp

@@ -28,8 +28,9 @@
 #include <eda_draw_frame.h>
 
 
-PICKER_TOOL::PICKER_TOOL()
-    : TOOL_INTERACTIVE( "common.InteractivePicker" )
+PICKER_TOOL::PICKER_TOOL() :
+        TOOL_INTERACTIVE( "common.InteractivePicker" ),
+        m_frame( nullptr )
 {
     resetPicker();
 }

pcbnew/tools/global_edit_tool.cpp

@@ -37,7 +37,8 @@
 
 
 GLOBAL_EDIT_TOOL::GLOBAL_EDIT_TOOL() :
-    PCB_TOOL_BASE( "pcbnew.GlobalEdit" )
+        PCB_TOOL_BASE( "pcbnew.GlobalEdit" ),
+        m_selectionTool( nullptr )
 {
 }
 

thirdparty/dxflib_qcad/dl_dxf.cpp

@@ -6425,10 +6425,10 @@ void DL_Dxf::test()
     stripWhiteSpace( &buf6 );
     std::cout << "2 buf6: '" << buf6 << "'\n";
 
-    delete( buf1 );
-    delete( buf2 );
-    delete( buf3 );
-    delete( buf4 );
-    delete( buf5 );
-    delete( buf6 );
+    delete[] buf1;
+    delete[] buf2;
+    delete[] buf3;
+    delete[] buf4;
+    delete[] buf5;
+    delete[] buf6;
 }