usb: xhci: tegra: use time64_t for printing timestamp

The time_t type and time_to_tm() function are deprecated because
of y2038 problems. In this driver, they are used to pretty-print
the timestamp of the firmware build. This is fine as long as
we don't get a firmware build past 2038.

Converting to time64_t and time64_to_tm() avoids the deprecated
interfaces and works until 2106, when the firmware-defined
data structure overflows.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-tegra.c

@@ -771,7 +771,7 @@ static int tegra_xusb_load_firmware(struct tegra_xusb *tegra)
 	struct device *dev = tegra->dev;
 	const struct firmware *fw;
 	unsigned long timeout;
-	time_t timestamp;
+	time64_t timestamp;
 	struct tm time;
 	u64 address;
 	u32 value;
@@ -877,7 +877,7 @@ static int tegra_xusb_load_firmware(struct tegra_xusb *tegra)
 	}
 
 	timestamp = le32_to_cpu(header->fwimg_created_time);
-	time_to_tm(timestamp, 0, &time);
+	time64_to_tm(timestamp, 0, &time);
 
 	dev_info(dev, "Firmware timestamp: %ld-%02d-%02d %02d:%02d:%02d UTC\n",
 		 time.tm_year + 1900, time.tm_mon + 1, time.tm_mday,