getaddrinfo.3: Fix off-by-one error in example client program

Reported-by: Eric Sanchis <eric.sanchis@iut-rodez.fr>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man3/getaddrinfo.3

@@ -819,7 +819,7 @@ main(int argc, char *argv[])
         len = strlen(argv[j]) + 1;
                 /* +1 for terminating null byte */
 
-        if (len + 1 > BUF_SIZE) {
+        if (len > BUF_SIZE) {
             fprintf(stderr,
                     "Ignoring long message in argument %d\\n", j);
             continue;