[PATCH] Fix compilation with MinGW.

[Stefan Tauner]

This was broken since r1557 when we got rid of some exit calls, but returned
-1 instead which is not a valid HANDLE value.

Signed-off-by: Stefan Tauner 
---
 programmer.h |    2 ++
 serial.c     |   14 +++++++-------
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/programmer.h b/programmer.h
index 303fbc4..51b9c40 100644
--- a/programmer.h
+++ b/programmer.h
@@ -636,8 +636,10 @@ void serprog_delay(int usecs);
 /* serial.c */
 #ifdef _WIN32
 typedef HANDLE fdtype;
+#define SER_INV_FD	INVALID_HANDLE_VALUE
 #else
 typedef int fdtype;
+#define SER_INV_FD	-1
 #endif

void sp_flush_incoming(void);
diff --git a/serial.c b/serial.c
index 7443a3c..05c7d04 100644
--- a/serial.c
+++ b/serial.c
@@ -115,7 +115,7 @@ fdtype sp_openserport(char *dev, unsigned int baud)
    	dev2 = malloc(strlen(dev) + 5);
    	if (!dev2) {
    		msg_perr("Error: Out of memory: %s\n", strerror(errno));
-			return -1;
+			return SER_INV_FD;
    	}
    	strcpy(dev2, "\\.\");
    	strcpy(dev2 + 4, dev);
@@ -126,12 +126,12 @@ fdtype sp_openserport(char *dev, unsigned int baud)
    	free(dev2);
    if (fd == INVALID_HANDLE_VALUE) {
    	msg_perr("Error: cannot open serial port: %s\n", strerror(errno));
-		return -1;
+		return SER_INV_FD;
    }
    DCB dcb;
    if (!GetCommState(fd, &dcb)) {
    	msg_perr("Error: Could not fetch serial port configuration: %s\n", strerror(errno));
-		return -1;
+		return SER_INV_FD;
    }
    switch (baud) {
    	case 9600: dcb.BaudRate = CBR_9600; break;
@@ -140,14 +140,14 @@ fdtype sp_openserport(char *dev, unsigned int baud)
    	case 57600: dcb.BaudRate = CBR_57600; break;
    	case 115200: dcb.BaudRate = CBR_115200; break;
    	default: msg_perr("Error: Could not set baud rate: %s\n", strerror(errno));
-			 return -1;
+			 return SER_INV_FD;
    }
    dcb.ByteSize = 8;
    dcb.Parity = NOPARITY;
    dcb.StopBits = ONESTOPBIT;
    if (!SetCommState(fd, &dcb)) {
    	msg_perr("Error: Could not change serial port configuration: %s\n", strerror(errno));
-		return -1;
+		return SER_INV_FD;
    }
    return fd;
 #else
@@ -156,7 +156,7 @@ fdtype sp_openserport(char *dev, unsigned int baud)
    fd = open(dev, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd < 0) {
    	msg_perr("Error: cannot open serial port: %s\n", strerror(errno));
-		return -1;
+		return SER_INV_FD;
    }
    fcntl(fd, F_SETFL, 0);
    tcgetattr(fd, &options);
@@ -164,7 +164,7 @@ fdtype sp_openserport(char *dev, unsigned int baud)
    	if (sp_baudtable[i].baud == 0) {
    		close(fd);
    		msg_perr("Error: cannot configure for baudrate %d\n", baud);
-			return -1;
+			return SER_INV_FD;
    	}
    	if (sp_baudtable[i].baud == baud) {
    		cfsetispeed(&options, sp_baudtable[i].flag);