Various small fixes found by IDEA inspection

src/se/vidstige/jadb/HostConnectionCommand.java

@@ -61,7 +61,7 @@ public class HostConnectionCommand {
         private String extractError(String response) {
             int lastColon = response.lastIndexOf(':');
             if (lastColon != -1) {
-                return response.substring(lastColon, response.length());
+                return response.substring(lastColon);
             } else {
                 return response;
             }

src/se/vidstige/jadb/managers/PackageManager.java

@@ -55,7 +55,7 @@ public class PackageManager {
         arguments.add("install");
         arguments.addAll(extraArguments);
         arguments.add(remote.getPath());
-        InputStream s = device.executeShell("pm", arguments.toArray(new String[arguments.size()]));
+        InputStream s = device.executeShell("pm", arguments.toArray(new String[0]));
         String result = Stream.readAll(s, StandardCharsets.UTF_8);
         remove(remote);
         verifyOperation("install", apkFile.getName(), result);

src/se/vidstige/jadb/server/AdbProtocolHandler.java

@@ -41,6 +41,7 @@ class AdbProtocolHandler implements Runnable {
             DataInputStream input = new DataInputStream(socket.getInputStream());
             DataOutputStream output = new DataOutputStream(socket.getOutputStream())
         ) {
+            //noinspection StatementWithEmptyBody
             while (processCommand(input, output)) {
                 // nothing to do here
             }