spi: pic32: remove unnecessary of_node_get()

Almost all spi drivers assign spi master->dev.of_node from
its parent platform device without additional refcounting.
It seems of_node_get() in pic32_spi_probe() is unnecessary
and there is no corresponding of_node_put().

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pic32.c

@@ -774,7 +774,7 @@ static int pic32_spi_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_master;
 
-	master->dev.of_node	= of_node_get(pdev->dev.of_node);
+	master->dev.of_node	= pdev->dev.of_node;
 	master->mode_bits	= SPI_MODE_3 | SPI_MODE_0 | SPI_CS_HIGH;
 	master->num_chipselect	= 1; /* single chip-select */
 	master->max_speed_hz	= clk_get_rate(pic32s->clk);