Make some improvements for Documentation/watchdog/src/watchdog-simple.c.

CC: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>

---
 Documentation/watchdog/src/watchdog-simple.c |   17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

Index: linux-2.6.23-rc9/Documentation/watchdog/src/watchdog-simple.c
===================================================================
--- linux-2.6.23-rc9.orig/Documentation/watchdog/src/watchdog-simple.c
+++ linux-2.6.23-rc9/Documentation/watchdog/src/watchdog-simple.c
@@ -3,15 +3,24 @@
 #include <unistd.h>
 #include <fcntl.h>
 
-int main(int argc, const char *argv[]) {
+int main(void) {
 	int fd = open("/dev/watchdog", O_WRONLY);
+	int ret = 0;
 	if (fd == -1) {
 		perror("watchdog");
-		exit(1);
+		exit(EXIT_FAILURE);
 	}
 	while (1) {
-		write(fd, "\0", 1);
-		fsync(fd);
+		ret = write(fd, "\0", 1);
+		if (ret != 1) {
+			ret = -1;
+			break;
+		}
+		ret = fsync(fd);
+		if (ret)
+			break;
 		sleep(10);
 	}
+	close(fd);
+	return ret;
 }
-
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