Fix DataSourceInputStream.read() for EOF cases

library/src/main/java/com/google/android/exoplayer/upstream/DataSourceInputStream.java

@@ -58,9 +58,12 @@ public class DataSourceInputStream extends InputStream {
 
 
   @Override
   @Override
   public int read() throws IOException {
   public int read() throws IOException {
-    read(singleByteArray);
+    int length = read(singleByteArray);
+    if(length != -1) {
       return singleByteArray[0] & 0xFF;
       return singleByteArray[0] & 0xFF;
     }
     }
+    return length;
+  }
 
 
   @Override
   @Override
   public int read(byte[] buffer) throws IOException {
   public int read(byte[] buffer) throws IOException {