patch 8.2.1615: Vim9: cannot pass "true" to searchdecl()

Problem:    Vim9: cannot pass "true" to searchdecl().
Solution:   use tv_get_bool_chk(). (closes #6881)

src/evalfunc.c

@@ -6876,8 +6876,8 @@ f_search(typval_T *argvars, typval_T *rettv)
     static void
 f_searchdecl(typval_T *argvars, typval_T *rettv)
 {
-    int		locally = 1;
+    int		locally = TRUE;
-    int		thisblock = 0;
+    int		thisblock = FALSE;
     int		error = FALSE;
     char_u	*name;
 
@@ -6886,9 +6886,9 @@ f_searchdecl(typval_T *argvars, typval_T *rettv)
     name = tv_get_string_chk(&argvars[0]);
     if (argvars[1].v_type != VAR_UNKNOWN)
     {
-	locally = (int)tv_get_number_chk(&argvars[1], &error) == 0;
+	locally = !(int)tv_get_bool_chk(&argvars[1], &error);
 	if (!error && argvars[2].v_type != VAR_UNKNOWN)
-	    thisblock = (int)tv_get_number_chk(&argvars[2], &error) != 0;
+	    thisblock = (int)tv_get_bool_chk(&argvars[2], &error);
     }
     if (!error && name != NULL)
 	rettv->vval.v_number = find_decl(name, (int)STRLEN(name),

src/testdir/test_vim9_func.vim

@@ -1547,6 +1547,10 @@ def Test_searchcount()
   bwipe!
 enddef
 
+def Test_searchdecl()
+  assert_equal(1, searchdecl('blah', true, true))
+enddef
+
 def Fibonacci(n: number): number
   if n < 2
     return n

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1615,
 /**/
     1614,
 /**/