Merge branch 'stable-4.8' into stable-4.9

* stable-4.8:
  Prepare 4.7.7-SNAPSHOT builds
  JGit v4.7.6.201810191618-r
  Update API problem filter
  Fix file handle leak in ObjectDownloadListener.onWritePossible
  Replace Findbugs with Spotbugs in org.eclipse.jgit/pom.xml
  Replace FindBugs with SpotBugs
  Prepare 4.4.2-SNAPSHOT builds
  JGit v4.0.3.201509231615-r

Change-Id: Ic18af2ddcba8f7a53eb27a33ea9f637adb941993
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/fs/ObjectDownloadListener.java

 				} else {
 					buffer.flip();
 				}
-			} catch(Throwable t) {
+			} catch (Throwable t) {
 				LOG.log(Level.SEVERE, t.getMessage(), t);
 				buffer = null;
 			} finally {
 				if (buffer != null) {
 					outChannel.write(buffer);
 				} else {
+					try {
+						in.close();
+					} catch (IOException e) {
+						LOG.log(Level.SEVERE, e.getMessage(), e);
+					}
 					try {
 						out.close();
 					} finally {