SnapdragonCamera: Fix camera double open issue.

If switch camera occurs before open camera thread completes, it
will result in camera double open exception. Hence wait for open
thread and then do switch.

Change-Id: Id12f149a2b850dc7cf1c872cec016c95e604f713

src/com/android/camera/PhotoModule.java

@@ -655,6 +655,14 @@ public class PhotoModule
         setCameraId(mCameraId);
 
         // from onPause
+        try {
+            if (mOpenCameraThread != null) {
+                mOpenCameraThread.join();
+                mOpenCameraThread = null;
+            }
+        } catch (InterruptedException ex) {
+            // ignore
+        }
         closeCamera();
         mUI.collapseCameraControls();
         mUI.clearFaces();