wbuf_common: avoid trysendfile on empty sf_count

We may unnecessarily drop persistent connections from this bug,
and we had an incorrect assertion in our unit test, even.

1 files changed, 2 insertions, 1 deletions

diff --git a/lib/yahns/wbuf_common.rb b/lib/yahns/wbuf_common.rb
index b3a4502..a3e737b 100644
--- a/lib/yahns/wbuf_common.rb
+++ b/lib/yahns/wbuf_common.rb
@@ -25,7 +25,8 @@ module Yahns::WbufCommon # :nodoc:
       raise "BUG: rv=#{rv.inspect} " \
             "on tmpio=#{@tmpio.inspect} " \
             "sf_offset=#@sf_offset sf_count=#@sf_count"
-    end while true
+    end while @sf_count > 0
+    wbuf_close(client)
   end
 
   def wbuf_close_common(client)