rspro_client_fsm: Fix memory leak processing RSPRO

Change-Id: I2c3710d152ce31d293a3693a70718c8712e2ac2b
Closes: OS#4097
diff --git a/src/rspro_client_fsm.c b/src/rspro_client_fsm.c
index 1527eff..768c15f 100644
--- a/src/rspro_client_fsm.c
+++ b/src/rspro_client_fsm.c
@@ -152,7 +152,7 @@
 	default:
 		goto invalid;
 	}
-
+	msgb_free(msg);
 	return rc;
 
 invalid: