poll: changed to include <poll.h> instead of <sys/poll.h>

This is a very cosmetic change but I think it is good to be
standards compliant. The standard defines <poll.h> and not
<sys/poll.h>:

http://pubs.opengroup.org/onlinepubs/009696799/basedefs/poll.h.html

When building against musl libc it silences some annoying cpp
warnings like this:

-----------------------------------------------------------------------
warning: #warning redirecting incorrect #include <sys/poll.h> to <poll.h> [-Wcpp]
-----------------------------------------------------------------------

Signed-off-by: Christian Wiese <chris@opensde.org>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/ring.h b/ring.h
index 55d5e96..9522410 100644
--- a/ring.h
+++ b/ring.h
@@ -20,7 +20,6 @@
 #include <sys/ioctl.h>
 #include <string.h>
 #include <poll.h>
-#include <sys/poll.h>
 
 #include "built_in.h"
 #include "die.h"