style fix

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/thread/PLock.java

@@ -45,6 +45,7 @@
 
 import com.oracle.graal.python.builtins.objects.type.PythonClass;
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
+
 public final class PLock extends AbstractPythonLock {
     private final Semaphore semaphore;