Lint cleanups.

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java

@@ -282,6 +282,8 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		InputStream in = null;
 		OutputStream out = null;
 		try {
+			// The done file may already exist from a previous installation
+			//noinspection ResultOfMethodCallIgnored
 			doneFile.delete();
 			// Unzip the Tor binary to the filesystem
 			in = getTorInputStream();
@@ -303,7 +305,8 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			in = getConfigInputStream();
 			out = new FileOutputStream(configFile);
 			copyAndClose(in, out);
-			doneFile.createNewFile();
+			if (!doneFile.createNewFile())
+				LOG.warning("Failed to create done file");
 		} catch (IOException e) {
 			IoUtils.tryToClose(in, LOG, WARNING);
 			IoUtils.tryToClose(out, LOG, WARNING);

bramble-core/src/test/java/org/briarproject/bramble/account/AccountManagerImplTest.java

@@ -318,6 +318,8 @@ public class AccountManagerImplTest extends BrambleMockTestCase {
 	}
 
 	private void storeDatabaseKey(File f, String hex) throws IOException {
+		// Create parent directory if it doesn't already exist
+		//noinspection ResultOfMethodCallIgnored
 		f.getParentFile().mkdirs();
 		FileOutputStream out = new FileOutputStream(f);
 		out.write(hex.getBytes("UTF-8"));

bramble-core/src/test/java/org/briarproject/bramble/db/DatabaseComponentImplTest.java

@@ -1393,7 +1393,6 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 	}
 
 	@Test
-	@SuppressWarnings("unchecked")
 	public void testMessageDependencies() throws Exception {
 		int shutdownHandle = 12345;
 		MessageId messageId2 = new MessageId(getRandomId());