fabrics: make 'disconnect' accepting only -n or -d

There is limited usability in specifying both -n and -d, so make
both exclusive.

Signed-off-by: Hannes Reinecke <[email protected]>

Author: hreinecke

fabrics.c

@@ -1189,6 +1189,11 @@ int nvmf_disconnect(const char *desc, int argc, char **argv)
 	if (ret)
 		return ret;
 
+	if (cfg.nqn && cfg.device) {
+		fprintf(stderr,
+			"Both device name [--device | -d] and NQN [--nqn | -n] are specified\n);
+		return -EINVAL;
+	}
 	if (!cfg.nqn && !cfg.device) {
 		fprintf(stderr,
 			"Neither device name [--device | -d] nor NQN [--nqn | -n] provided\n");