V4L/DVB: saa7164: move dereference under NULL check

The original code dereferenced "port" before checking it for NULL.  I
moved the test down below the check.  Also I changed the comparisons a
little so people wouldn't get confused and think "port" and "buf" were
ints instead of pointers.  (Probably that's what lead to this issue in
the first place.)

There is only one caller for this function and it passes non-NULL
pointers, so this is essentially a cleanup rather than a bugfix.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/saa7164/saa7164-buffer.c b/drivers/media/video/saa7164/saa7164-buffer.c
index 5713f3a4b76c952bf9b1db333bb547caf3e40376..ddd25d32723dc0436f2477a641afaa0d75d9f2d3 100644 (file)
--- a/drivers/media/video/saa7164/saa7164-buffer.c
+++ b/drivers/media/video/saa7164/saa7164-buffer.c
@@ -136,10 +136,11 @@ ret:
 int saa7164_buffer_dealloc(struct saa7164_tsport *port,
        struct saa7164_buffer *buf)
 {
-       struct saa7164_dev *dev = port->dev;
+       struct saa7164_dev *dev;
 
-       if ((buf == 0) || (port == 0))
+       if (!buf || !port)
                return SAA_ERR_BAD_PARAMETER;
+       dev = port->dev;
 
        dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n", __func__, buf);