MINOR: fd: move .et_possible into fdtab[].state

No need to keep this flag apart any more, let's merge it into the global
state.
diff --git a/include/haproxy/fd-t.h b/include/haproxy/fd-t.h
index cfcde39..e60f3b5 100644
--- a/include/haproxy/fd-t.h
+++ b/include/haproxy/fd-t.h
@@ -66,6 +66,7 @@
 #define FD_LINGER_RISK_BIT 16  /* must kill lingering before closing */
 #define FD_CLONED_BIT      17  /* cloned socket, requires EPOLL_CTL_DEL on close */
 #define FD_INITIALIZED_BIT 18  /* init phase was done (e.g. output pipe set non-blocking) */
+#define FD_ET_POSSIBLE_BIT 19  /* edge-triggered is possible on this FD */
 
 
 /* and flag values */
@@ -103,6 +104,7 @@
 #define FD_LINGER_RISK      (1U << FD_LINGER_RISK_BIT)
 #define FD_CLONED           (1U << FD_CLONED_BIT)
 #define FD_INITIALIZED      (1U << FD_INITIALIZED_BIT)
+#define FD_ET_POSSIBLE      (1U << FD_ET_POSSIBLE_BIT)
 
 /* This is the value used to mark a file descriptor as dead. This value is
  * negative, this is important so that tests on fd < 0 properly match. It
@@ -151,7 +153,6 @@
 	void (*iocb)(int fd);                /* I/O handler */
 	void *owner;                         /* the connection or listener associated with this fd, NULL if closed */
 	unsigned int state;                  /* FD state for read and write directions (FD_EV_*) + FD_POLL_* */
-	unsigned char et_possible:1;         /* 1 if edge-triggered is possible on this FD */
 	unsigned char exported:1;            /* 1 if the FD is exported and must not be closed */
 #ifdef DEBUG_FD
 	unsigned int event_count;            /* number of events reported */
diff --git a/include/haproxy/fd.h b/include/haproxy/fd.h
index 11dce3d..ba9bf8c 100644
--- a/include/haproxy/fd.h
+++ b/include/haproxy/fd.h
@@ -433,7 +433,6 @@
 	fdtab[fd].owner = owner;
 	fdtab[fd].iocb = iocb;
 	fdtab[fd].state = 0;
-	fdtab[fd].et_possible = 0;
 	fdtab[fd].exported = 0;
 #ifdef DEBUG_FD
 	fdtab[fd].event_count = 0;
@@ -441,7 +440,7 @@
 
 	/* conn_fd_handler should support edge-triggered FDs */
 	if ((global.tune.options & GTUNE_FD_ET) && fdtab[fd].iocb == sock_conn_iocb)
-		fdtab[fd].et_possible = 1;
+		fdtab[fd].state |= FD_ET_POSSIBLE;
 
 	fdtab[fd].thread_mask = thread_mask;
 	/* note: do not reset polled_mask here as it indicates which poller
diff --git a/src/ev_epoll.c b/src/ev_epoll.c
index 22ad454..27dbdb2 100644
--- a/src/ev_epoll.c
+++ b/src/ev_epoll.c
@@ -60,7 +60,7 @@
 	en = fdtab[fd].state;
 
 	/* Try to force EPOLLET on FDs that support it */
-	if (fdtab[fd].et_possible) {
+	if (fdtab[fd].state & FD_ET_POSSIBLE) {
 		/* already done ? */
 		if (polled_mask[fd].poll_recv & polled_mask[fd].poll_send & tid_bit)
 			return;