Use unset after unlock

https://github.com/friendica/friendica/pull/3554#issuecomment-313741392

diff --git a/src/Util/Lock.php b/src/Util/Lock.php
index 82d2fdda91d01c3a2606333db2419d5f9badf903..754a45ed9ea02dc0935fbb8031a7035fb2e8afc0 100644 (file)
--- a/src/Util/Lock.php
+++ b/src/Util/Lock.php
@@ -161,7 +161,7 @@ class Lock {
                                return false;
                        } else {
                                $success = @sem_release(self::$semaphore[$fn_name]);
-                               self::$semaphore[$fn_name] = 0;
+                               unset(self::$semaphore[$fn_name]);
                                return $success;
                        }
                }