Allow back seeking after an access EOF.

It is up to the access to refuse if it can't.
Anyway, the check was only for one path of a seek command (when using
stream_Read( NULL, size)).
This partially revert fc9f8518, please report any breakage.

src/input/stream.c

@@ -1058,15 +1058,11 @@ static int AStreamReadStream( stream_t *s, void *p_read, unsigned int i_read )
         stream_sys_t *p_sys = s->p_sys;
         access_t     *p_access = p_sys->p_access;
 
-        /* seeking after EOF is not what we want */
-        if( !( p_access->info.b_eof ) )
-        {
         bool   b_aseek;
         access_Control( p_access, ACCESS_CAN_SEEK, &b_aseek );
         if( b_aseek )
             return AStreamSeekStream( s, p_sys->i_pos + i_read ) ? 0 : i_read;
     }
-    }
 
 #ifdef STREAM_DEBUG
     msg_Dbg( s, "AStreamReadStream: %d pos=%"PRId64" tk=%d start=%"PRId64