drm/etnaviv: fix error code in event_alloc()

There are two "ret" variables declared in this function so setting
"ret = -EBUSY;" sets the wrong one.  The function ends up returning an
uninitialized variable.

Fixes: f098f9b8 ("drm/etnaviv: move runtime PM handling to events")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -1158,18 +1158,18 @@ static int event_alloc(struct etnaviv_gpu *gpu, unsigned nr_events,
 	int ret;
 
 	for (i = 0; i < nr_events; i++) {
-		unsigned long ret;
+		unsigned long remaining;
 
-		ret = wait_for_completion_timeout(&gpu->event_free, timeout);
+		remaining = wait_for_completion_timeout(&gpu->event_free, timeout);
 
-		if (!ret) {
+		if (!remaining) {
 			dev_err(gpu->dev, "wait_for_completion_timeout failed");
 			ret = -EBUSY;
 			goto out;
 		}
 
 		acquired++;
-		timeout = ret;
+		timeout = remaining;
 	}
 
 	spin_lock(&gpu->event_spinlock);