Make BitArray.readUnsignedByte() a bit more clear by using int value instead of…

Make BitArray.readUnsignedByte() a bit more clear by using int value instead of byte to prevent unnecessary convert from int to byte.

library/src/main/java/com/google/android/exoplayer/util/BitArray.java

@@ -148,16 +148,15 @@ public final class BitArray {
    * @return The value of the parsed byte.
    */
   public int readUnsignedByte() {
-    byte b;
+    int value;
     if (bitOffset != 0) {
-      b = (byte) ((data[byteOffset] << bitOffset)
-          | ((data[byteOffset + 1] & 0xFF) >> (8 - bitOffset)));
+      value = (data[byteOffset] << bitOffset)
+          | ((data[byteOffset + 1] & 0xFF) >>> (8 - bitOffset));
     } else {
-      b = data[byteOffset];
+      value = data[byteOffset];
     }
     byteOffset++;
-    // Converting a signed byte into unsigned.
-    return b & 0xFF;
+    return value & 0xFF;
   }
 
   /**