spi: spidev_test: Fix typo in error message

Fix the spelling of 'output' in the error message.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

tools/spi/spidev_test.c

@@ -150,7 +150,7 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
 
 		ret = write(out_fd, rx, len);
 		if (ret != len)
-			pabort("not all bytes written to utput file");
+			pabort("not all bytes written to output file");
 
 		close(out_fd);
 	}