Make sure that file handle is freed when an error is raised to prevent access exception on subsequent deletion attempt.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9970 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/plugins/rfpdf/lib/tcpdf.rb

@@ -2981,8 +2981,9 @@ class TCPDF
 		if (colspace=='Indexed' and pal.empty?)
 			Error('Missing palette in ' + file);
 		end
-		f.close
 		return {'w' => w, 'h' => h, 'cs' => colspace, 'bpc' => bpc, 'f'=>'FlateDecode', 'parms' => parms, 'pal' => pal, 'trns' => trns, 'data' => data}
+	ensure
+    f.close
 	end
 
 	#