patch 8.2.3240: Lua print() does not work properly

Problem:    Lua print() does not work properly.
Solution:   Put back lua_pop().

src/if_lua.c

@@ -1737,6 +1737,7 @@ luaV_print(lua_State *L)
 	if (i > 1)
 	    luaL_addchar(&b, ' '); // use space instead of tab
 	luaV_addlstring(&b, s, l, 0);
+	lua_pop(L, 1);
     }
     luaL_pushresult(&b);
     if (!got_int)

src/testdir/test_lua.vim

@@ -870,8 +870,8 @@ endfunc
 
 " Test for dealing with strings containing newlines and null character
 func Test_lua_string_with_newline()
-  let x = execute('lua print("Hello\nWorld")')
-  call assert_equal("\nHello\nWorld", x)
+  let x = execute('lua print("Hello\nWorld", 2)')
+  call assert_equal("\nHello\nWorld 2", x)
   new
   lua k = vim.buffer(vim.eval('bufnr()'))
   lua k:insert("Hello\0World", 0)

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3240,
 /**/
     3239,
 /**/