Prevent sign extension in IccUtils.parseToRGB

When a signed byte value is taken from an array, make sure to truncate
it so it doesn't have a problem when it's sign extended to 32-bit.

Change-Id: Ic2b35c317e21c63dff960501145a4f3074b687ad

telephony/java/com/android/internal/telephony/IccUtils.java

@@ -397,7 +397,7 @@ public class IccUtils {
         int bits = data[valueIndex++] & 0xFF;
         int colorNumber = data[valueIndex++] & 0xFF;
         int clutOffset = ((data[valueIndex++] & 0xFF) << 8)
-                | data[valueIndex++];
+                | (data[valueIndex++] & 0xFF);
         length = length - 6;
 
         int[] colorIndexArray = getCLUT(data, clutOffset, colorNumber);