fix warnings for unused but set variables and shadowed variables * quadcc.cc (Fquadcc): Delete unused variable err_excess. * find.cc (find_nonzero_elem_idx (const PermMatrix&, int, octave_idx_type, int)): Delete unused variable end_nc. * eigs.cc (Feigs): Delete unused variable bmat. * conv2.cc (Fconvn): Delete unused variable separable. * colamd.cc (Fetree, Fsymamd): Delete unused variable nnz. * ccolamd.cc (Fcsymamd): Delete unused variable nnz. * pt-pr-code.cc (tree_print_code::visit_index_expression): Delete unused variable expr_has_parens. * pt-mat.cc (tree_matrix::rvalue1): Delete unused variables all_complex_p and all_strings_p (tm_const::init): Eliminate shadowed variables. * gl-render.cc (opengl_renderer::draw_image): Delete unused variable ok.

--- a/src/DLD-FUNCTIONS/quadcc.cc	Sun Sep 25 15:06:10 2011 -0400
+++ b/src/DLD-FUNCTIONS/quadcc.cc	Sun Sep 25 16:52:23 2011 -0400
@@ -1569,7 +1569,7 @@
 
   /* Actual variables (as opposed to constants above). */
   double m, h, ml, hl, mr, hr, temp;
-  double igral, err, igral_final, err_final, err_excess;
+  double igral, err, igral_final, err_final;
   int nivals, neval = 0;
   int i, j, d, split, t;
   int nnans, nans[33];
@@ -1766,7 +1766,6 @@
   /* Initialize some global values. */
   igral_final = 0.0;
   err_final = 0.0;
-  err_excess = 0.0;
 
 
   /* Main loop. */