Coverity fixes

Uninitialized variables: CID #163188 and #174187
Unused variable: CID #168698

include/geometry/shape_arc.h

@@ -38,9 +38,10 @@ public:
 
     SHAPE_ARC( const VECTOR2I& aArcCenter, const VECTOR2I& aArcStartPoint,
                double aCenterAngle, int aWidth = 0 ) :
-        SHAPE( SH_ARC ), m_p0( aArcStartPoint ), m_pc( aArcCenter ), m_centralAngle( aCenterAngle )
-        {
-        };
+        SHAPE( SH_ARC ), m_p0( aArcStartPoint ), m_pc( aArcCenter ), m_centralAngle( aCenterAngle ),
+        m_width( aWidth )
+    {
+    }
 
     SHAPE_ARC( const SHAPE_ARC& aOther )
         : SHAPE( SH_ARC )
@@ -51,7 +52,7 @@ public:
         m_width = aOther.m_width;
     }
 
-    ~SHAPE_ARC() {};
+    ~SHAPE_ARC() {}
 
     SHAPE* Clone() const override
     {
@@ -68,8 +69,8 @@ public:
         return BOX2I();    // fixme
     }
 
-    bool    Collide( const SEG& aSeg, int aClearance = 0 ) const override;
-    bool    Collide( const VECTOR2I& aP, int aClearance = 0 ) const override;
+    bool Collide( const SEG& aSeg, int aClearance = 0 ) const override;
+    bool Collide( const VECTOR2I& aP, int aClearance = 0 ) const override;
 
     void SetWidth( int aWidth )
     {

pcbnew/footprint_info_impl.cpp

@@ -306,7 +306,9 @@ size_t FOOTPRINT_LIST_IMPL::CountFinished()
 FOOTPRINT_LIST_IMPL::FOOTPRINT_LIST_IMPL() :
     m_loader( nullptr ),
     m_count_finished( 0 ),
-    m_progress_reporter( nullptr )
+    m_libraries_last_mod_checksum( 0 ),
+    m_progress_reporter( nullptr ),
+    m_cancelled( false )
 {
 }
 

pcbnew/pad_draw_functions.cpp

@@ -535,8 +535,6 @@ void D_PAD::DrawShape( EDA_RECT* aClipBox, wxDC* aDC, PAD_DRAWINFO& aDrawInfo )
             SHAPE_POLY_SET clearance_outline;
             clearance_outline.Append( outline );
             clearance_outline.Inflate( aDrawInfo.m_Mask_margin.x, segmentToCircleCount );
-
-            poly = &clearance_outline.Outline( 0 );
         }
         else
         {