8261601: free memory in early return in Java_sun_nio_ch_sctp_SctpChan…

…nelImpl_receive0

Reviewed-by: clanger, dfuchs, bpb

src/jdk.sctp/unix/native/libsctp/SctpChannelImpl.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -475,6 +475,7 @@ JNIEXPORT jint JNICALL Java_sun_nio_ch_sctp_SctpChannelImpl_receive0
                 iov->iov_len = SCTP_NOTIFICATION_SIZE - rv;
                 if ((rv = recvmsg(fd, msg, flags)) < 0) {
                     handleSocketError(env, errno);
+                    free(newBuf);
                     return 0;
                 }
                 bufp = newBuf;