Fix constructor for SafeBufferedOutputStream

The size shoould be passed to BufferedOutputStream's constructor.
All callers seem to use the default, but that could change.

Change-Id: I874afee6a9114698805e36813781547e6aa328a5

org.eclipse.jgit/src/org/eclipse/jgit/util/io/SafeBufferedOutputStream.java

 	/**
 	 * @see BufferedOutputStream#BufferedOutputStream(OutputStream)
 	 * @param out
+	 *            underlying output stream
 	 */
 	public SafeBufferedOutputStream(OutputStream out) {
 		super(out);
 	/**
 	 * @see BufferedOutputStream#BufferedOutputStream(OutputStream, int)
 	 * @param out
+	 *            underlying output stream
 	 * @param size
+	 *            buffer size
 	 */
 	public SafeBufferedOutputStream(OutputStream out, int size) {
-		super(out);
+		super(out, size);
 	}
 
 	@Override