Fix null ref

When getResizedImageData fails to scale down an image to a size that'll fit in
the remaining available message space, return null rather than trying to
dereference the null byte array.

Change-Id: Ibb1f5ddd935f952e5f90d8835947cc46bc138aa2

src/com/android/mms/ui/UriImage.java

@@ -283,7 +283,7 @@ private byte[] getResizedImageData(int widthLimit, int heightLimit, int byteLimi
                 attempts++;
             } while ((os == null || os.size() > byteLimit) && attempts < NUMBER_OF_RESIZE_ATTEMPTS);
 
-            return os.toByteArray();
+            return os == null ? null : os.toByteArray();
         } catch (FileNotFoundException e) {
             Log.e(TAG, e.getMessage(), e);
             return null;