ptp_ocp: drop duplicate NULL check in ptp_ocp_detach()

Since platform_device_unregister() is NULL-aware, we don't need to duplicate
this check. Remove it and fold the rest of the code.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Vadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/ptp/ptp_ocp.c

@@ -3701,9 +3701,7 @@ ptp_ocp_detach(struct ptp_ocp *bp)
 		serial8250_unregister_port(bp->mac_port);
 	if (bp->nmea_port != -1)
 		serial8250_unregister_port(bp->nmea_port);
-	if (bp->spi_flash)
 	platform_device_unregister(bp->spi_flash);
-	if (bp->i2c_ctrl)
 	platform_device_unregister(bp->i2c_ctrl);
 	if (bp->i2c_clk)
 		clk_hw_unregister_fixed_rate(bp->i2c_clk);