Revert "Called XInitThreads in vaapi."

This reverts commit 7c93516a.
It is useless as 6adc3961 added it already.

modules/codec/avcodec/vaapi.c

@@ -133,9 +133,6 @@ static int Open( vlc_va_vaapi_t *p_va, int i_codec_id )
     p_va->image.image_id = VA_INVALID_ID;
 
     /* Create a VA display */
-    if( !XInitThreads() )
-        return VLC_EGENERIC;
-
     p_va->p_display_x11 = XOpenDisplay(NULL);
     if( !p_va->p_display_x11 )
         goto error;
@@ -489,6 +486,7 @@ vlc_va_t *vlc_va_NewVaapi( int i_codec_id )
     vlc_va_vaapi_t *p_va = calloc( 1, sizeof(*p_va) );
     if( !p_va )
         return NULL;
+
     if( Open( p_va, i_codec_id ) )
     {
         free( p_va );