HID: picolcd: testing the wrong variable

"ref_cnt" is a point to the reference count and it's non-null.  We really
want to test the reference count itself.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-picolcd.c b/drivers/hid/hid-picolcd.c
index 346f0e3..c0bdeba 100644
--- a/drivers/hid/hid-picolcd.c
+++ b/drivers/hid/hid-picolcd.c
@@ -547,7 +547,7 @@
 	ref_cnt--;
 	mutex_lock(&info->lock);
 	(*ref_cnt)--;
-	may_release = !ref_cnt;
+	may_release = !*ref_cnt;
 	mutex_unlock(&info->lock);
 	if (may_release) {
 		framebuffer_release(info);