staging: atomisp: simplify if statement in atomisp_get_sensor_fps()

If v4l2_subdev_call() gets the global frame interval values,
it returned 0 and it could be checked whether numerator is zero or not.

If the numerator is not zero, the fps could be calculated in this function.
If not, it just returns 0.
Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/media/atomisp/pci/atomisp2/atomisp_cmd.c

@@ -153,20 +153,18 @@ struct atomisp_acc_pipe *atomisp_to_acc_pipe(struct video_device *dev)
 
 static unsigned short atomisp_get_sensor_fps(struct atomisp_sub_device *asd)
 {
-	struct v4l2_subdev_frame_interval frame_interval;
+	struct v4l2_subdev_frame_interval fi;
 	struct atomisp_device *isp = asd->isp;
-	unsigned short fps;
 
-	if (v4l2_subdev_call(isp->inputs[asd->input_curr].camera,
-	    video, g_frame_interval, &frame_interval)) {
-		fps = 0;
-	} else {
-		if (frame_interval.interval.numerator)
-			fps = frame_interval.interval.denominator /
-			    frame_interval.interval.numerator;
-		else
-			fps = 0;
-	}
+	unsigned short fps = 0;
+	int ret;
+
+	ret = v4l2_subdev_call(isp->inputs[asd->input_curr].camera,
+			       video, g_frame_interval, &fi);
+
+	if (!ret && fi.interval.numerator)
+		fps = fi.interval.denominator / fi.interval.numerator;
+
 	return fps;
 }