examples: Zero fds in sshnetcat

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

examples/examples_common.h

@@ -14,6 +14,10 @@ clients must be made or how a client should react.
 #define EXAMPLES_COMMON_H_
 
 #include <libssh/libssh.h>
+
+/** Zero a structure */
+#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
+
 int authenticate_console(ssh_session session);
 int authenticate_kbdint(ssh_session session, const char *password);
 int verify_knownhost(ssh_session session);

examples/sshnetcat.c

@@ -90,6 +90,7 @@ static void select_loop(ssh_session session,ssh_channel channel){
 		do{
             int fd;
 
+            ZERO_STRUCT(fds);
 			FD_ZERO(&fds);
 			if(!eof)
 				FD_SET(0,&fds);