Clean up instances of make_argv(). * error.cc (Fwarning, Flasterr, Flastwarn): Use '[]' to access element of vector, rather than '()'. * help.cc (F__which__): Call make_argv without an argument rather than with "". * input.cc: (Fecho): Call make_argv without an argument rather than with "". * load-save.cc: Remove useless comments. Re-indent lines. Join lines unnecessarily split. * ovl.cc (make_argv): Invert if/else/error.

--- a/libinterp/corefcn/help.cc
+++ b/libinterp/corefcn/help.cc
@@ -1272,7 +1272,7 @@
 Undocumented internal function.\n\
 @end deftypefn")
 {
-  string_vector argv = args.make_argv ("");
+  string_vector argv = args.make_argv ();
 
   int nargin = argv.numel ();