FM: Fix the crash issue with RT

Change the RT to string format.

Change-Id: I0f6beeb6295f9b02b94102123385f07edf1ad255
CRs-Fixed: 674023
diff --git a/fmapp2/src/com/caf/fmradio/FMRadio.java b/fmapp2/src/com/caf/fmradio/FMRadio.java
index 5b858c4..7110e09 100644
--- a/fmapp2/src/com/caf/fmradio/FMRadio.java
+++ b/fmapp2/src/com/caf/fmradio/FMRadio.java
@@ -2867,7 +2867,7 @@
       void startScroll() {
          TextView textView = mView.get();
          if (textView != null) {
-            mOriginalString = (String)textView.getText();
+            mOriginalString = textView.getText().toString();
             mStringlength = mOriginalString.length();
             if (mStringlength > 0) {
                mStatus = SCROLLER_STARTING;