Reset thread_data->error_info.setjmp to 0.

This is a follow-up to commit 1f68feef03dd9d5b5a4cac0a8f69b9f4cb1da915.
tile_worker_hook() should reset thread_data->error_info.setjmp to 0
before returning.

BUG=aomedia:2001

Change-Id: I15d96cddc4ccc9970bbb563e33368001937480d7

av1/decoder/decodeframe.c

diff --git a/av1/decoder/decodeframe.c b/av1/decoder/decodeframe.c
index d1da63c..ae74d5d 100644
--- a/av1/decoder/decodeframe.c
+++ b/av1/decoder/decodeframe.c
@@ -3056,6 +3056,7 @@
       break;
     }
   }
+  thread_data->error_info.setjmp = 0;
   return !td->xd.corrupted;
 }