APPS: Remove an unreachable statement in s_client.c

A Solaris compiler complains:

    "apps/s_client.c", line 2994: statement not reached

It takes a bit of scrutiny to see that this is true, on all platforms.
Reviewed-by: NPaul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15719)

apps/s_client.c

@@ -2991,7 +2991,6 @@ int s_client_main(int argc, char **argv)
         }
     }
 
-    ret = 0;
  shut:
     if (in_init)
         print_stuff(bio_c_out, con, full_log);