free incoming msg after processing by RSL

diff --git a/src/abis_rsl.c b/src/abis_rsl.c
index 79f83ab..ad90dea 100644
--- a/src/abis_rsl.c
+++ b/src/abis_rsl.c
@@ -666,5 +666,6 @@
 			rslh->msg_discr);
 		return -EINVAL;
 	}
+	msgb_free(msg);
 	return rc;
 }