s390/dasd: Switch to use %ptSp

Use %ptSp instead of open coded variants to print content of
struct timespec64 in human readable format.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Stefan Haberland <sth@linux.ibm.com>
Link: https://patch.msgid.link/20251113150217.3030010-19-andriy.shevchenko@linux.intel.com
Signed-off-by: Petr Mladek <pmladek@suse.com>

Author: andy-shev

drivers/s390/block/dasd.c

@@ -974,8 +974,7 @@ static void dasd_stats_array(struct seq_file *m, unsigned int *array)
 static void dasd_stats_seq_print(struct seq_file *m,
 				 struct dasd_profile_info *data)
 {
-	seq_printf(m, "start_time %lld.%09ld\n",
-		   (s64)data->starttod.tv_sec, data->starttod.tv_nsec);
+	seq_printf(m, "start_time %ptSp\n", &data->starttod);
 	seq_printf(m, "total_requests %u\n", data->dasd_io_reqs);
 	seq_printf(m, "total_sectors %u\n", data->dasd_io_sects);
 	seq_printf(m, "total_pav %u\n", data->dasd_io_alias);