Documentation/watchdog: Fix the file descriptor leak when no cmdline arg given

we start a infinite loop when user gives ./watchdog-test, and when user
ctrl + c's the program, we just exit immeadiately with out closing the
filedescriptor of the watchdog device. a signal handler is used to
do the job of closing the filedescriptor and exiting the program.

Signed-off-by: Devendra Naga <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

Documentation/watchdog/src/watchdog-test.c

···
 #include <string.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <signal.h>
 #include <sys/ioctl.h>
 #include <linux/types.h>
 #include <linux/watchdog.h>
···
  * The main program.  Run the program with "-d" to disable the card,
  * or "-e" to enable the card.
  */
+
+void term(int sig)
+{
+    close(fd);
+    fprintf(stderr, "Stopping watchdog ticks...\n");
+    exit(0);
+}
+
 int main(int argc, char *argv[])
 {
     int flags;
···
 	fprintf(stderr, "Watchdog Ticking Away!\n");
 	fflush(stderr);
     }
+
+    signal(SIGINT, term);
 
     while(1) {
 	keep_alive();