demux: adaptive: do not filter schemes

also fixes a mishandled exception.
let late fail on regular access creation.

modules/demux/adaptive/Streams.cpp

@@ -196,13 +196,10 @@ bool AbstractStream::startDemux()
     if(demuxer)
         return false;
 
-    try
-    {
-        demuxersource->Reset();
-        demuxer = createDemux(format);
-    } catch(int) {
+    demuxersource->Reset();
+    demuxer = createDemux(format);
+    if(!demuxer)
         msg_Err(p_realdemux, "Failed to create demuxer");
-    }
 
     return !!demuxer;
 }

modules/demux/adaptive/http/Chunk.cpp

@@ -125,7 +125,7 @@ HTTPChunkSource::HTTPChunkSource(const std::string& url, HTTPConnectionManager *
     prepared = false;
     eof = false;
     if(!init(url))
-        throw VLC_EGENERIC;
+        eof = true;
 }
 
 HTTPChunkSource::~HTTPChunkSource()

modules/demux/adaptive/http/HTTPConnectionManager.cpp

@@ -96,6 +96,11 @@ AbstractConnection * HTTPConnectionManager::getConnection(ConnectionParams &para
     if(!conn)
     {
         conn = factory->createConnection(p_object, params);
+        if(!conn)
+        {
+            vlc_mutex_unlock(&lock);
+            return NULL;
+        }
 
         connectionPool.push_back(conn);