test if access dc1394 is right earlier in the probing process to avoid side...

test if access dc1394 is right earlier in the probing process to avoid side effect (irrelevant errors) for others.
Signed-off-by: Jean-Paul Saman <jpsaman@videolan.org>

THANKS

@@ -137,6 +137,7 @@ Jean-François Massol <jf.massol -<@t> gmail.com> - Qt4 Sout work
 Jérôme Guilbaud - Update of the WinAmp 5 VLC skin
 Joel Arvidsson <dogai at privat.utfors.se> - Swedish translation
 Joeri van Dooren <joeri at van.dooren.be> - OS X icon (v0.4.0)
+Joseph Tulou <brezhoneg1 at yahoo.fr> - small dc1394 patch
 Jörg<vlc-ml at aab.noctis dot de> - VLM seek/show media functions
 Johannes Buchner <buchner.johannes at gmx dot at> - Hotkeys for zoom
 Johen Michael Zorko <zorko at att.net> - fix for delay issues in udp sout

modules/access/dc1394.c

@@ -218,6 +218,9 @@ static int Open( vlc_object_t *p_this )
     int i_aspect;
     int result = 0;
 
+    if( strncmp(p_demux->psz_access, "dc1394", 6) != 0 )
+        return VLC_EGENERIC;
+
     /* Set up p_demux */
     p_demux->pf_demux = Demux;
     p_demux->pf_control = Control;
@@ -834,9 +837,6 @@ static int process_options( demux_t *p_demux )
     char *state = NULL;
     float rate_f;
 
-    if( strncmp(p_demux->psz_access, "dc1394", 6) != 0 )
-        return VLC_EGENERIC;
-
     psz_dup = strdup( p_demux->psz_path );
     psz_parser = psz_dup;
     for( token = strtok_r( psz_parser,":",&state); token;