[PATCH] util: Remove redundant checks in the openpty()

[AlexChen]

As we can see from the following function call stack, the amaster and the aslave
cannot be NULL: char_pty_open() -> qemu_openpty_raw() -> openpty().
In addition, the amaster and the aslave has been dereferenced at the beginning
of the openpty(). So the checks on amaster and aslave in the openpty() are 
redundant.

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Alex Chen <alex.chen@huawei.com>
---
 util/qemu-openpty.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/util/qemu-openpty.c b/util/qemu-openpty.c
index eb17f5b0bc..427f43a769 100644
--- a/util/qemu-openpty.c
+++ b/util/qemu-openpty.c
@@ -80,10 +80,9 @@ static int openpty(int *amaster, int *aslave, char *name,
             (termp != NULL && tcgetattr(sfd, termp) < 0))
                 goto err;

-        if (amaster)
-                *amaster = mfd;
-        if (aslave)
-                *aslave = sfd;
+        *amaster = mfd;
+        *aslave = sfd;
+
         if (winp)
                 ioctl(sfd, TIOCSWINSZ, winp);

-- 
2.19.1