[PATCH] Revert "lib: fix direction bit in GPIO code"

[Marcus Müller]

This reverts commit ba64a7459a43652354990855176a7d8dad5b9d54.

The mentioned commit leads to nonfunctionality of Fitipower FC0012
dongles (tested by a small horde of students) and doesn't increase
functionality on my "RTL-SDR.com" branded R820T-based dongle.
---
 src/librtlsdr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librtlsdr.c b/src/librtlsdr.c
index b369a5d..6c079a5 100644
--- a/src/librtlsdr.c
+++ b/src/librtlsdr.c
@@ -570,7 +570,7 @@ void rtlsdr_set_gpio_output(rtlsdr_dev_t *dev, uint8_t gpio)
        gpio = 1 << gpio;
 
        r = rtlsdr_read_reg(dev, SYSB, GPD, 1);
-       rtlsdr_write_reg(dev, SYSB, GPD, r & ~gpio, 1);
+       rtlsdr_write_reg(dev, SYSB, GPO, r & ~gpio, 1);
        r = rtlsdr_read_reg(dev, SYSB, GPOE, 1);
        rtlsdr_write_reg(dev, SYSB, GPOE, r | gpio, 1);
 }
-- 
2.13.6