Make sure a Stream is closed upon errors in IpLogGenerator

Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>

org.eclipse.jgit.iplog/src/org/eclipse/jgit/iplog/IpLogGenerator.java

@@ -236,6 +236,7 @@ public class IpLogGenerator {
 		SimpleDateFormat dt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 		File list = new File(repo.getDirectory(), "gerrit_committers");
 		BufferedReader br = new BufferedReader(new FileReader(list));
+		try {
 			String line;
 
 			while ((line = br.readLine()) != null) {
@@ -267,6 +268,9 @@ public class IpLogGenerator {
 				who.addActiveRange(new ActiveRange(begin, end));
 				committersByEmail.put(email, who);
 			}
+		} finally {
+			br.close();
+		}
 	}
 
 	private Date parseDate(SimpleDateFormat dt, String value)