Fix some of the issues pointed by android lint tool

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=139915885

library/src/androidTest/java/com/google/android/exoplayer2/util/AtomicFileTest.java

@@ -50,7 +50,7 @@ public class AtomicFileTest extends InstrumentationTestCase {
     assertFalse(file.exists());
   }
 
-  public void testWriteEndRead() throws Exception {
+  public void testWriteRead() throws Exception {
     OutputStream output = atomicFile.startWrite();
     output.write(5);
     atomicFile.endWrite(output);

library/src/main/java/com/google/android/exoplayer2/upstream/cache/CacheDataSink.java

@@ -138,6 +138,7 @@ public final class CacheDataSink implements DataSink {
     outputStreamBytesWritten = 0;
   }
 
+  @SuppressWarnings("ThrowFromFinallyBlock")
   private void closeCurrentOutputStream() throws IOException {
     if (outputStream == null) {
       return;
@@ -150,13 +151,14 @@ public final class CacheDataSink implements DataSink {
       success = true;
     } finally {
       Util.closeQuietly(outputStream);
+      outputStream = null;
+      File fileToCommit = file;
+      file = null;
       if (success) {
-        cache.commitFile(file);
+        cache.commitFile(fileToCommit);
       } else {
-        file.delete();
+        fileToCommit.delete();
       }
-      outputStream = null;
-      file = null;
     }
   }
 

library/src/main/java/com/google/android/exoplayer2/upstream/cache/CacheEvictor.java

@@ -22,7 +22,7 @@ package com.google.android.exoplayer2.upstream.cache;
 public interface CacheEvictor extends Cache.Listener {
 
   /**
-   * Called when cache has beeen initialized.
+   * Called when cache has been initialized.
    */
   void onCacheInitialized();