Fix VP8IoTeardownHook being called twice on worker sync failure
Fix VP8IoTeardownHook being called twice on worker sync failure

idec_dec.c, DecodeRemaining: Set decoder state to ERROR to prevent VP8ExitCritical to be called again

Change-Id: Id5f893f45c348e1c529680d930e640f780a73d4c

PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,webmproject/libwebp,PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,webmproject/libwebp,PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp