JSSE: decrement internalIOSendBufOffset by sendSz when copying out buffered data into output ByteBuffer

Author: rlm2002

src/java/com/wolfssl/provider/jsse/WolfSSLEngine.java

@@ -498,8 +498,10 @@ private int CopyOutPacket(ByteBuffer out) {
 
                 if (sendSz != this.internalIOSendBufOffset) {
                     System.arraycopy(this.internalIOSendBuf, sendSz,
-                             this.internalIOSendBuf, 0,
-                             this.internalIOSendBufOffset - sendSz);
+                                this.internalIOSendBuf, 0,
+                                this.internalIOSendBufOffset - sendSz);
+                    this.internalIOSendBufOffset =
+                                this.internalIOSendBufOffset - sendSz;
                 }
                 else {
                     /* reset internalIOSendBufOffset to zero, no data left */