close_ioengine() clears ->data after calling engine cleanup

Then we can remove that bit from io engines.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/engines/guasi.c b/engines/guasi.c
index b65061e..a7589dc 100644
--- a/engines/guasi.c
+++ b/engines/guasi.c
@@ -213,7 +213,6 @@
 		free(ld->reqs);
 		free(ld->io_us);
 		free(ld);
-		td->io_ops->data = NULL;
 	}
 	GDBG_PRINT(("fio_guasi_cleanup(%p) DONE\n", ld));
 }
diff --git a/engines/libaio.c b/engines/libaio.c
index 7e69c23..e6b926c 100644
--- a/engines/libaio.c
+++ b/engines/libaio.c
@@ -177,7 +177,6 @@
 		free(ld->iocbs);
 		free(ld->io_us);
 		free(ld);
-		td->io_ops->data = NULL;
 	}
 }
 
diff --git a/engines/net.c b/engines/net.c
index 0efd336..4591477 100644
--- a/engines/net.c
+++ b/engines/net.c
@@ -426,7 +426,6 @@
 			close(nd->pipes[1]);
 
 		free(nd);
-		td->io_ops->data = NULL;
 	}
 }
 
diff --git a/engines/null.c b/engines/null.c
index eb80501..f434550 100644
--- a/engines/null.c
+++ b/engines/null.c
@@ -83,7 +83,6 @@
 		if (nd->io_us)
 			free(nd->io_us);
 		free(nd);
-		td->io_ops->data = NULL;
 	}
 }
 
diff --git a/engines/posixaio.c b/engines/posixaio.c
index ddc75d1..acd215c 100644
--- a/engines/posixaio.c
+++ b/engines/posixaio.c
@@ -184,7 +184,6 @@
 	if (pd) {
 		free(pd->aio_events);
 		free(pd);
-		td->io_ops->data = NULL;
 	}
 }
 
diff --git a/engines/sg.c b/engines/sg.c
index cb44fa4..d7c0a6d 100644
--- a/engines/sg.c
+++ b/engines/sg.c
@@ -311,8 +311,6 @@
 		free(sd->pfds);
 		free(sd->sgbuf);
 		free(sd);
-
-		td->io_ops->data = NULL;
 	}
 }
 
diff --git a/engines/splice.c b/engines/splice.c
index 5a288b5..2753bfa 100644
--- a/engines/splice.c
+++ b/engines/splice.c
@@ -246,7 +246,6 @@
 		close(sd->pipe[0]);
 		close(sd->pipe[1]);
 		free(sd);
-		td->io_ops->data = NULL;
 	}
 }
 
diff --git a/engines/sync.c b/engines/sync.c
index 3b96ee1..4ca04d5 100644
--- a/engines/sync.c
+++ b/engines/sync.c
@@ -274,7 +274,6 @@
 	free(sd->iovecs);
 	free(sd->io_us);
 	free(sd);
-	td->io_ops->data = NULL;
 }
 
 static struct ioengine_ops ioengine_rw = {
diff --git a/engines/syslet-rw.c b/engines/syslet-rw.c
index 0fdf752..47610a0 100644
--- a/engines/syslet-rw.c
+++ b/engines/syslet-rw.c
@@ -222,7 +222,6 @@
 		free(sd->events);
 		free(sd->ring);
 		free(sd);
-		td->io_ops->data = NULL;
 	}
 }
 
diff --git a/ioengines.c b/ioengines.c
index fb68763..662d55d 100644
--- a/ioengines.c
+++ b/ioengines.c
@@ -154,8 +154,10 @@
 {
 	dprint(FD_IO, "close ioengine %s\n", td->io_ops->name);
 
-	if (td->io_ops->cleanup)
+	if (td->io_ops->cleanup) {
 		td->io_ops->cleanup(td);
+		td->io_ops->data = NULL;
+	}
 
 	if (td->io_ops->dlhandle)
 		dlclose(td->io_ops->dlhandle);