Fixed handling of the ready flag with kqueue.

There is nothing to do more when recv() has returned 0,
so we should drop the flag.

src/os/unix/ngx_readv_chain.c

diff --git a/src/os/unix/ngx_readv_chain.c b/src/os/unix/ngx_readv_chain.c
index c2c21b4..8836c81 100644
--- a/src/os/unix/ngx_readv_chain.c
+++ b/src/os/unix/ngx_readv_chain.c
@@ -129,6 +129,7 @@
                                   "%d available bytes", rev->available);
 #endif
 
+                    rev->ready = 0;
                     rev->eof = 1;
                     rev->available = 0;
                 }

src/os/unix/ngx_recv.c

diff --git a/src/os/unix/ngx_recv.c b/src/os/unix/ngx_recv.c
index 1640cdb..86675df 100644
--- a/src/os/unix/ngx_recv.c
+++ b/src/os/unix/ngx_recv.c
@@ -80,6 +80,7 @@
                      * even if kqueue reported about available data
                      */
 
+                    rev->ready = 0;
                     rev->eof = 1;
                     rev->available = 0;
                 }