fix a busy CPU case when slow and fast file serving clients are connected at

the same time.  Flag clients on return from select/poll and only process those.
Also fix a rare race which could leave clients in pending

svn path=/icecast/trunk/icecast/; revision=8070

src/fserve.h

@@ -15,14 +15,16 @@
 
 #include <stdio.h>
 
-typedef struct
+typedef struct _fserve_t
 {
     client_t *client;
 
     FILE *file;
     int offset;
     int datasize;
+    int ready;
     unsigned char *buf;
+    struct _fserve_t *next;
 } fserve_t;
 
 void fserve_initialize(void);