[media] e4000: simplify boolean tests

Instead of using if (foo == false), just use
if (!foo).

That allows a faster mental parsing when analyzing the
code.
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/tuners/e4000.c

@@ -400,7 +400,7 @@ static int e4000_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 	struct e4000 *s = container_of(ctrl->handler, struct e4000, hdl);
 	int ret;
 
-	if (s->active == false)
+	if (!s->active)
 		return 0;
 
 	switch (ctrl->id) {
@@ -423,7 +423,7 @@ static int e4000_s_ctrl(struct v4l2_ctrl *ctrl)
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	int ret;
 
-	if (s->active == false)
+	if (!s->active)
 		return 0;
 
 	switch (ctrl->id) {