RecoverySystem: do not check if socket is closed

LocalSocket does not support checking whether the socket is closed explicitly.
The write or read functions will still return IOException when the socket is
closed, so just rely on that.

Bug: 145102966
Test: Factory reset from Home->Menu->Settings->System->Advanced->Reset options->Erase all Data
Change-Id: I9094f07c2f709f4a270af06db8f02e72e1d7faf0
(cherry picked from commit c6c2619ba228ce9e8d38d2d9a4685f9740321da2)
diff --git a/services/core/java/com/android/server/recoverysystem/RecoverySystemService.java b/services/core/java/com/android/server/recoverysystem/RecoverySystemService.java
index fe18fbf..fdb14be 100644
--- a/services/core/java/com/android/server/recoverysystem/RecoverySystemService.java
+++ b/services/core/java/com/android/server/recoverysystem/RecoverySystemService.java
@@ -400,13 +400,9 @@
          * Sends a command to the uncrypt service.
          *
          * @param command command to send to the uncrypt service
-         * @throws IOException if the socket is closed or there was an error writing to the socket
+         * @throws IOException if there was an error writing to the socket
          */
         public void sendCommand(String command) throws IOException {
-            if (mLocalSocket.isClosed()) {
-                throw new IOException("socket is closed");
-            }
-
             byte[] cmdUtf8 = command.getBytes(StandardCharsets.UTF_8);
             mOutputStream.writeInt(cmdUtf8.length);
             mOutputStream.write(cmdUtf8, 0, cmdUtf8.length);
@@ -415,25 +411,17 @@
         /**
          * Reads the status from the uncrypt service which is usually represented as a percentage.
          * @return an integer representing the percentage completed
-         * @throws IOException if the socket was closed or there was an error reading the socket
+         * @throws IOException if there was an error reading the socket
          */
         public int getPercentageUncrypted() throws IOException {
-            if (mLocalSocket.isClosed()) {
-                throw new IOException("socket is closed");
-            }
-
             return mInputStream.readInt();
         }
 
         /**
          * Sends a confirmation to the uncrypt service.
-         * @throws IOException if the socket was closed or there was an error writing to the socket
+         * @throws IOException if there was an error writing to the socket
          */
         public void sendAck() throws IOException {
-            if (mLocalSocket.isClosed()) {
-                throw new IOException("socket is closed");
-            }
-
             mOutputStream.writeInt(0);
         }