maint: Review C++ files for style and coding conventions. * __ftp__.cc (F__ftp_cwd__, F__ftp_mget__), __isprimelarge__.cc (F__isprimelarge__, F__pollardrho__), debug.cc (Fdbclear), file-io.cc (Ftempdir): Don't bother to define nargin if it is used only once in function. Instead, just call args.length () for the one instance. * data.cc (fill_matrix): Eliminate useless break statement after error() which throws exception. * qr.cc (Fqr), __ode15__.cc (IDA::integrate, IDA::event, IDA::interpolate, IDA::outputfun): Use true or false rather than 0 or 1 when assigning to bool variables. maint: Review C++ files for style and coding conventions.

--- a/libinterp/corefcn/qr.cc	Thu Dec 01 15:00:07 2022 -0500
+++ b/libinterp/corefcn/qr.cc	Wed Nov 30 20:27:16 2022 -0800
@@ -321,8 +321,8 @@
 
   bool economy = false;
   bool is_cmplx = false;
-  bool have_b = 0;
-  bool vector_p = 0;
+  bool have_b = false;
+  bool vector_p = false;
 
   if (arg.iscomplex ())
     is_cmplx = true;