MDEV-15524 Do not write garbage for temporary tables

fsp_init_file_page_low(): Always initialize the page.

storage/innobase/fsp/fsp0fsp.cc

@@ -600,17 +600,14 @@ fsp_init_file_page_low(
 	buf_block_t*	block)	/*!< in: pointer to a page */
 {
 	page_t*		page	= buf_block_get_frame(block);
-	page_zip_des_t*	page_zip= buf_block_get_page_zip(block);
 
-	if (!fsp_is_system_temporary(block->page.id.space())) {
-		memset(page, 0, UNIV_PAGE_SIZE);
-	}
+	memset(page, 0, UNIV_PAGE_SIZE);
 
 	mach_write_to_4(page + FIL_PAGE_OFFSET, block->page.id.page_no());
 	mach_write_to_4(page + FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID,
 			block->page.id.space());
 
-	if (page_zip) {
+	if (page_zip_des_t* page_zip= buf_block_get_page_zip(block)) {
 		memset(page_zip->data, 0, page_zip_get_size(page_zip));
 		memcpy(page_zip->data + FIL_PAGE_OFFSET,
 		       page + FIL_PAGE_OFFSET, 4);