Core: Closed Captions memleak

(cherry picked from commit 0c24ead9)
Signed-off-by: Derk-Jan Hartman <hartman@videolan.org>

src/input/decoder.c

@@ -1266,6 +1266,7 @@ static void DecoderGetCc( decoder_t *p_dec, decoder_t *p_dec_cc )
     decoder_owner_sys_t *p_owner = p_dec->p_owner;
     block_t *p_cc;
     bool pb_present[4];
+    bool b_processed = false;
     int i;
     int i_cc_decoder;
 
@@ -1297,8 +1298,12 @@ static void DecoderGetCc( decoder_t *p_dec, decoder_t *p_dec_cc )
         else
             DecoderProcess( p_owner->cc.pp_decoder[i], p_cc );
         i_cc_decoder--;
+        b_processed = true;
     }
     vlc_mutex_unlock( &p_owner->lock );
+
+    if( !b_processed )
+        block_Release( p_cc );
 }
 
 static void DecoderPlayVideo( decoder_t *p_dec, picture_t *p_picture,