[PATCH 1/3] Fix error message in sp_openserport().

[Stefan Tauner]

free seems to touch errno on windows...?

Signed-off-by: Stefan Tauner 
---
 serial.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/serial.c b/serial.c
index 7e47dcc..11a749c 100644
--- a/serial.c
+++ b/serial.c
@@ -109,6 +109,7 @@ fdtype sp_openserport(char *dev, unsigned int baud)
 #ifdef _WIN32
    HANDLE fd;
    char *dev2 = dev;
+	int err;
    if ((strlen(dev) > 3) && (tolower((unsigned char)dev[0]) == 'c') &&
        (tolower((unsigned char)dev[1]) == 'o') &&
        (tolower((unsigned char)dev[2]) == 'm')) {
@@ -122,10 +123,11 @@ fdtype sp_openserport(char *dev, unsigned int baud)
    }
    fd = CreateFile(dev2, GENERIC_READ | GENERIC_WRITE, 0, NULL,
    		OPEN_EXISTING, 0, NULL);
+	err = errno; // free may change errno
    if (dev2 != dev)
    	free(dev2);
    if (fd == INVALID_HANDLE_VALUE) {
-		msg_perr("Error: cannot open serial port: %s\n", strerror(errno));
+		msg_perr("Error: cannot open serial port: %s\n", strerror(err));
    	return SER_INV_FD;
    }
    DCB dcb;