patch 8.2.1563: Vim9: error when using '%" with setbufvar() r getbufvar()

Problem:    Vim9: error when using '%" with setbufvar() or getbufvar().
Solution:   Use tv_get_buf_from_arg(). (closes #6816)
diff --git a/src/evalvars.c b/src/evalvars.c
index ecd0ce6..efab6ab 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -3662,10 +3662,8 @@
     dictitem_T	*v;
     int		done = FALSE;
 
-    (void)tv_get_number(&argvars[0]);	    // issue errmsg if type error
     varname = tv_get_string_chk(&argvars[1]);
-    ++emsg_off;
-    buf = tv_get_buf(&argvars[0], FALSE);
+    buf = tv_get_buf_from_arg(&argvars[0]);
 
     rettv->v_type = VAR_STRING;
     rettv->vval.v_string = NULL;
@@ -3717,8 +3715,6 @@
     if (!done && argvars[2].v_type != VAR_UNKNOWN)
 	// use the default value
 	copy_tv(&argvars[2], rettv);
-
-    --emsg_off;
 }
 
 /*
@@ -3789,9 +3785,8 @@
 
     if (check_secure())
 	return;
-    (void)tv_get_number(&argvars[0]);	    // issue errmsg if type error
     varname = tv_get_string_chk(&argvars[1]);
-    buf = tv_get_buf(&argvars[0], FALSE);
+    buf = tv_get_buf_from_arg(&argvars[0]);
     varp = &argvars[2];
 
     if (buf != NULL && varname != NULL && varp != NULL)
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 0575836..09c8457 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1426,6 +1426,9 @@
    settabwinvar(1, 1, '&ts', 15)
    assert_equal(15, &ts)
    setlocal ts=8
+
+   setbufvar('%', 'myvar', 123)
+   assert_equal(123, getbufvar('%', 'myvar'))
 enddef
 
 def Test_setreg()
diff --git a/src/version.c b/src/version.c
index f2d89f6..d606f1e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1563,
+/**/
     1562,
 /**/
     1561,