Revert "qtdemux: also push buffers without encryption info instead of dropping them"

This reverts commit 762e9c645ec13513c62eb5a3800d7406e01cdcb7.

This was pushed by mistake
diff --git a/gst/isomp4/qtdemux.c b/gst/isomp4/qtdemux.c
index ceef7bf..705bdf7 100644
--- a/gst/isomp4/qtdemux.c
+++ b/gst/isomp4/qtdemux.c
@@ -5566,25 +5566,26 @@
       gst_pad_push_event (stream->pad, event);
     }
 
+    if (info->crypto_info == NULL) {
+      GST_DEBUG_OBJECT (qtdemux, "cenc metadata hasn't been parsed yet");
+      gst_buffer_unref (buf);
+      goto exit;
+    }
 
-    if (info->crypto_info == NULL)
-      GST_DEBUG_OBJECT (qtdemux, "cenc metadata hasn't been parsed yet, pushing buffer as if it wasn't encrypted");
-    else {
-      /* The end of the crypto_info array matches our n_samples position,
-       * so count backward from there */
-      index = stream->sample_index - stream->n_samples + info->crypto_info->len;
-      if (G_LIKELY (index >= 0 && index < info->crypto_info->len)) {
-        /* steal structure from array */
-        crypto_info = g_ptr_array_index (info->crypto_info, index);
-        g_ptr_array_index (info->crypto_info, index) = NULL;
-        GST_LOG_OBJECT (qtdemux, "attaching cenc metadata [%u/%u]", index,
-            info->crypto_info->len);
-        if (!crypto_info || !gst_buffer_add_protection_meta (buf, crypto_info))
-          GST_ERROR_OBJECT (qtdemux, "failed to attach cenc metadata to buffer");
-      } else {
-        GST_INFO_OBJECT (qtdemux, "No crypto info with index %d and sample %d",
-            index, stream->sample_index);
-      }
+    /* The end of the crypto_info array matches our n_samples position,
+     * so count backward from there */
+    index = stream->sample_index - stream->n_samples + info->crypto_info->len;
+    if (G_LIKELY (index >= 0 && index < info->crypto_info->len)) {
+      /* steal structure from array */
+      crypto_info = g_ptr_array_index (info->crypto_info, index);
+      g_ptr_array_index (info->crypto_info, index) = NULL;
+      GST_LOG_OBJECT (qtdemux, "attaching cenc metadata [%u/%u]", index,
+          info->crypto_info->len);
+      if (!crypto_info || !gst_buffer_add_protection_meta (buf, crypto_info))
+        GST_ERROR_OBJECT (qtdemux, "failed to attach cenc metadata to buffer");
+    } else {
+      GST_INFO_OBJECT (qtdemux, "No crypto info with index %d and sample %d",
+          index, stream->sample_index);
     }
   }