staging: gasket: sysfs: remove check for refcount already zero

Remove the check for refcount already zero, which shouldn't be
necessary.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gasket/gasket_sysfs.c

@@ -111,8 +111,6 @@ static void put_mapping(struct gasket_sysfs_mapping *mapping)
 	}
 
 	mutex_lock(&mapping->mutex);
-	if (refcount_read(&mapping->refcount.refcount) == 0)
-		dev_err(mapping->device, "Refcount is already 0\n");
 	if (kref_put(&mapping->refcount, release_entry)) {
 		dev_dbg(mapping->device, "Removing Gasket sysfs mapping\n");
 		/*