media: ipu3-imgu: Remove dead code for NULL check

Since ipu3_css_buf_dequeue() never returns NULL, remove the
dead code to fix static checker warning:

drivers/staging/media/ipu3/ipu3.c:493 imgu_isr_threaded()
warn: 'b' is an error pointer or valid

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
[Bug report: https://lore.kernel.org/linux-media/20190104122856.GA1169@kadam/]
Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/staging/media/ipu3/ipu3.c b/drivers/staging/media/ipu3/ipu3.c
index d521b3afb8b1a8ff1a09c387696190f6017143ff..839d9398f8e9ca6b889aa2e9ec01120ef4edd16d 100644 (file)
--- a/drivers/staging/media/ipu3/ipu3.c
+++ b/drivers/staging/media/ipu3/ipu3.c
@@ -489,12 +489,11 @@ static irqreturn_t imgu_isr_threaded(int irq, void *imgu_ptr)
                        mutex_unlock(&imgu->lock);
                } while (PTR_ERR(b) == -EAGAIN);
 
-               if (IS_ERR_OR_NULL(b)) {
-                       if (!b || PTR_ERR(b) == -EBUSY) /* All done */
-                               break;
-                       dev_err(&imgu->pci_dev->dev,
-                               "failed to dequeue buffers (%ld)\n",
-                               PTR_ERR(b));
+               if (IS_ERR(b)) {
+                       if (PTR_ERR(b) != -EBUSY)       /* All done */
+                               dev_err(&imgu->pci_dev->dev,
+                                       "failed to dequeue buffers (%ld)\n",
+                                       PTR_ERR(b));
                        break;
                }