[librdmacm] fix udpong segfault on rconnect error

Before patch:
[root@rdma-qe-05 librdmacm (master *)]$ udpong -s 172.31.45.4
name      bytes   xfers   total       time     Gb/sec    usec/xfer
rconnect: No such file or directory
Segmentation fault (core dumped)

After patch:
[root@rdma-qe-05 librdmacm (master *)]$ ./examples/udpong -s 172.31.45.4
name      bytes   xfers   total       time     Gb/sec    usec/xfer
rconnect: No such file or directory

Simple fix, just a missing goto on error, so we don't try to do things
that are already expected to fail.

CC: Sean Hefty <[email protected]>
Signed-off-by: Jarod Wilson <[email protected]>

Author: jarodwilson

examples/udpong.c

@@ -427,6 +427,7 @@ static int client_connect(void)
 	if (ret) {
 		perror("rconnect");
 		rs_close(rs);
+		goto out;
 	}
 
 	msg.op = msg_op_login;