rxrpc: Fix an error goto in rxrpc_connect_call()

Fix an error-handling goto in rxrpc_connect_call() whereby it will jump to
free the bundle it failed to allocate.

Fixes: 245500d8 ("rxrpc: Rewrite the client connection manager")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David Howells <dhowells@redhat.com>