fix buffer_get

CHANGES

@@ -15,6 +15,7 @@
   switch io_fds from array to newly implemented (hopefully thread-safe) iarray
   switch epoll from level triggering to edge triggering
   introduce io_eagain_read and io_eagain_write (discontinue using io_eagain plz)
+  fix buffer_get
 
 0.29:
   save 8 bytes in taia.h for 64-bit systems

buffer/buffer_get.c

@@ -7,7 +7,8 @@ ssize_t buffer_get(buffer* b,char* x,size_t len) {
   done=0;
   if ((ssize_t)len < 0) len=(ssize_t)(((size_t)-1)>>1);
   while (len) {
-    if ((blen=buffer_feed(b))<=0) return blen;
+    if ((blen=buffer_feed(b))<0) return blen;
+    if (blen==0) break;
     if (blen>=(ssize_t)len)
       blen=(ssize_t)len;
     byte_copy(x,(size_t)blen,b->x+b->p);