serial.c: file descriptor '0' is a valid value

if stdin/stdout/stderr are all closed by our environment, it may very
well be that opening a serial port returns fd == 0.

Change-Id: Ifd9670260883a35da0629369e0d49e467d5b4d72

1 files changed, 2 insertions, 2 deletions

diff --git a/src/serial.c b/src/serial.c
index 6316e459..05bdc86e 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -59,7 +59,7 @@
 int
 osmo_serial_init(const char *dev, speed_t baudrate)
 {
-	int rc, fd=0, v24, flags;
+	int rc, fd=-1, v24, flags;
 	struct termios tio;
 
 	/* Use nonblock as the device might block otherwise */
@@ -122,7 +122,7 @@ osmo_serial_init(const char *dev, speed_t baudrate)
 	return fd;
 
 error:
-	if (fd)
+	if (fd >= 0)
 		close(fd);
 	return rc;
 }