vim-patch:8.2.1049: Vim9: leaking memory when using continuation line

Problem:    Vim9: leaking memory when using continuation line.
Solution:   Keep a pointer to the continuation line in evalarg_T.  Centralize
            checking for a next command.

b171fb1790

Omit eval_next_line(): Vim9 script only.

vim-patch:8.2.1050: missing change in struct

Problem:    Missing change in struct.
Solution:   Add missing change.

65a8ed37f7

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/ex_docmd.c

@@ -2328,6 +2328,7 @@ doend:
   }
 
   ex_nesting_level--;
+  xfree(ea.cmdline_tofree);
 
   return ea.nextcmd;
 }
@@ -4432,7 +4433,7 @@ static void ex_colorscheme(exarg_T *eap)
     char *expr = xstrdup("g:colors_name");
 
     emsg_off++;
-    char *p = eval_to_string(expr, NULL, false);
+    char *p = eval_to_string(expr, false);
     emsg_off--;
     xfree(expr);