eliminate unnecessary uses of nargin * __dsearchn__.cc, betainc.cc, bsxfun.cc, data.cc, debug.cc, det.cc, dot.cc, error.cc, file-io.cc, givens.cc, graphics.cc, hess.cc, hex2num.cc, input.cc, inv.cc, mgorth.cc, ordschur.cc, pr-output.cc, profiler.cc, rcond.cc, regexp.cc, sqrtm.cc, sub2ind.cc, sylvester.cc, syscalls.cc, sysdep.cc, tsearch.cc, urlwrite.cc, utils.cc, variables.cc: Don't use nargin variable unless it is used more than once.

--- a/libinterp/corefcn/file-io.cc	Mon Dec 07 13:26:03 2015 -0500
+++ b/libinterp/corefcn/file-io.cc	Mon Dec 07 13:54:01 2015 -0500
@@ -711,9 +711,7 @@
 {
   octave_value_list retval;
 
-  int nargin = args.length ();
-
-  if (nargin > 0)
+  if (args.length () > 0)
     warning ("freport: ignoring extra arguments");
 
   octave_stdout << octave_stream_list::list_open_files ();