rdma: initialize the rd struct

Initialize the rd struct so port_idx is 0 unless set otherwise.
Otherwise, strict_port queries end up passing an uninitialized PORT
nlattr.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: David Ahern <dsahern@gmail.com>

rdma/rdma.c

@@ -135,7 +135,7 @@ int main(int argc, char **argv)
 	bool json_output = false;
 	bool force = false;
 	char *filename;
-	struct rd rd;
+	struct rd rd = {};
 	int opt;
 	int err;