Fix an issue with SASL integrity/confidentiality

Fixed an issue that could cause the LDAP SDK to incorrectly handle
data read from a server when the communication is protected with
SASL integrity or confidentiality.  Thanks to Boris Danilovich for
reporting this problem and identifying the cause.

docs/release-notes.html

@@ -13,6 +13,14 @@ <h3>Version 4.0.14</h3>
               </p>
 
               <ul>
+                <li>
+                  Fixed an issue that could cause the LDAP SDK to incorrectly handle data read
+                  from a server when the communication is protected with SASL integrity or
+                  confidentiality.Thanks to Boris Danilovich for reporting this problem and
+                  identifying the cause.
+                  <br><br>
+                </li>
+
                 <li>
                   Fixed a minor typo in the <tt>ldapsearch</tt> usage information
                   <br><br>

src/com/unboundid/asn1/ASN1StreamReader.java

@@ -297,7 +297,7 @@ public int peek()
     }
     else
     {
-      if (saslInputStream == null)
+      if ((saslInputStream == null) || (saslInputStream.available() <= 0))
       {
         readAndDecodeSASLData(-1);
       }