Fixing memory errors

The CGColorRef was retained once too often while the UIImage was overreleased.

src/osx/carbon/utilscocoa.mm

@@ -167,9 +167,7 @@ WXWindow wxOSXGetKeyWindow()
 
 WX_UIImage  wxOSXGetUIImageFromCGImage( CGImageRef image )
 {
-    UIImage  *newImage = [UIImage imageWithCGImage:image];
-    [newImage autorelease];
-    return( newImage );
+    return  [UIImage imageWithCGImage:image];
 }
 
 wxBitmap wxOSXCreateSystemBitmap(const wxString& name, const wxString &client, const wxSize& size)

src/osx/iphone/window.mm

@@ -476,7 +476,7 @@ void  wxWidgetImpl::Convert( wxPoint *pt , wxWidgetImpl *from , wxWidgetImpl *to
 
 void wxWidgetIPhoneImpl::SetBackgroundColour( const wxColour &col )
 {
-    m_osxView.backgroundColor = [[UIColor alloc] initWithCGColor:col.GetCGColor()];
+    m_osxView.backgroundColor = [UIColor colorWithCGColor:col.GetCGColor()];
 }
 
 bool wxWidgetIPhoneImpl::SetBackgroundStyle(wxBackgroundStyle style)