[patch] Modify local_listen declaration in netcat.c

[Nan Xiao]

Hi tech@,

The following patch modify `local_listen' declaration to conform to
`getaddrinfo', thanks!

Index: netcat.c
===================================================================
RCS file: /cvs/src/usr.bin/nc/netcat.c,v
retrieving revision 1.193
diff -u -p -r1.193 netcat.c
--- netcat.c    6 Sep 2018 13:23:02 -0000       1.193
+++ netcat.c    7 Sep 2018 09:37:02 -0000
@@ -122,7 +122,7 @@ void        atelnet(int, unsigned char *, unsig
 int    strtoport(char *portstr, int udp);
 void   build_ports(char *);
 void   help(void) __attribute__((noreturn));
-int    local_listen(char *, char *, struct addrinfo);
+int    local_listen(const char *, const char *, struct addrinfo);
 void   readwrite(int, struct tls *);
 void   fdpass(int nfd) __attribute__((noreturn));
 int    remote_connect(const char *, const char *, struct addrinfo);
@@ -994,7 +994,7 @@ timeout_connect(int s, const struct sock
  * address. Returns -1 on failure.
  */
 int
-local_listen(char *host, char *port, struct addrinfo hints)
+local_listen(const char *host, const char *port, struct addrinfo hints)
 {
        struct addrinfo *res, *res0;
        int s = -1, ret, x = 1, save_errno;

-- 
Best Regards
Nan Xiao