patch 8.2.2665: test failures

Problem:    Test failures.
Solution:   Check more specific feature.  Add missing change.

Author: brammool

src/evalbuffer.c

@@ -88,6 +88,8 @@ find_buffer(typval_T *avar)
 
     if (avar->v_type == VAR_NUMBER)
 	buf = buflist_findnr((int)avar->vval.v_number);
+    else if (in_vim9script() && check_for_string_arg(avar, 0) == FAIL)
+	return NULL;
     else if (avar->v_type == VAR_STRING && avar->vval.v_string != NULL)
     {
 	buf = buflist_findname_exp(avar->vval.v_string);

src/testdir/test_vim9_builtin.vim

@@ -133,7 +133,7 @@ def Test_balloon_show()
 enddef
 
 def Test_balloon_split()
-  CheckFeature balloon_eval
+  CheckFeature balloon_eval_term
 
   assert_fails('balloon_split(true)', 'E1174:')
 enddef

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2665,
 /**/
     2664,
 /**/