fs/namespace: fnic: Switch to use %ptTd

Use %ptTd instead of open-coded variant to print contents
of time64_t type in human readable form.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>

fs/namespace.c

@@ -2617,15 +2617,12 @@ static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *
 	   (ktime_get_real_seconds() + TIME_UPTIME_SEC_MAX > sb->s_time_max)) {
 		char *buf = (char *)__get_free_page(GFP_KERNEL);
 		char *mntpath = buf ? d_path(mountpoint, buf, PAGE_SIZE) : ERR_PTR(-ENOMEM);
-		struct tm tm;
 
-		time64_to_tm(sb->s_time_max, 0, &tm);
-
-		pr_warn("%s filesystem being %s at %s supports timestamps until %04ld (0x%llx)\n",
+		pr_warn("%s filesystem being %s at %s supports timestamps until %ptTd (0x%llx)\n",
 			sb->s_type->name,
 			is_mounted(mnt) ? "remounted" : "mounted",
-			mntpath,
-			tm.tm_year+1900, (unsigned long long)sb->s_time_max);
+			mntpath, &sb->s_time_max,
+			(unsigned long long)sb->s_time_max);
 
 		free_page((unsigned long)buf);
 		sb->s_iflags |= SB_I_TS_EXPIRY_WARNED;