Replace NULL with nullptr

Also fixed some lines that were too long, and a few other minor
details.

Change-Id: I6efba5fb6e03eb5d0a300fddb2a75bf8e2f175cb
diff --git a/runtime/native/java_lang_Thread.cc b/runtime/native/java_lang_Thread.cc
index d3b52ba..be7022e 100644
--- a/runtime/native/java_lang_Thread.cc
+++ b/runtime/native/java_lang_Thread.cc
@@ -43,7 +43,7 @@
   ScopedFastNativeObjectAccess soa(env);
   MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
-  return (thread != NULL) ? thread->IsInterrupted() : JNI_FALSE;
+  return (thread != nullptr) ? thread->IsInterrupted() : JNI_FALSE;
 }
 
 static void Thread_nativeCreate(JNIEnv* env, jclass, jobject java_thread, jlong stack_size,
@@ -64,7 +64,7 @@
   ThreadState internal_thread_state = (has_been_started ? kTerminated : kStarting);
   MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
-  if (thread != NULL) {
+  if (thread != nullptr) {
     internal_thread_state = thread->GetState();
   }
   switch (internal_thread_state) {
@@ -99,7 +99,7 @@
 static jboolean Thread_nativeHoldsLock(JNIEnv* env, jobject java_thread, jobject java_object) {
   ScopedObjectAccess soa(env);
   mirror::Object* object = soa.Decode<mirror::Object*>(java_object);
-  if (object == NULL) {
+  if (object == nullptr) {
     ThrowNullPointerException("object == null");
     return JNI_FALSE;
   }
@@ -112,7 +112,7 @@
   ScopedFastNativeObjectAccess soa(env);
   MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
-  if (thread != NULL) {
+  if (thread != nullptr) {
     thread->Interrupt(soa.Self());
   }
 }
@@ -133,7 +133,7 @@
   bool timed_out;
   // Take suspend thread lock to avoid races with threads trying to suspend this one.
   Thread* thread = thread_list->SuspendThreadByPeer(peer, true, false, &timed_out);
-  if (thread != NULL) {
+  if (thread != nullptr) {
     {
       ScopedObjectAccess soa(env);
       thread->SetThreadName(name.c_str());
@@ -154,7 +154,7 @@
   ScopedObjectAccess soa(env);
   MutexLock mu(soa.Self(), *Locks::thread_list_lock_);
   Thread* thread = Thread::FromManagedThread(soa, java_thread);
-  if (thread != NULL) {
+  if (thread != nullptr) {
     thread->SetNativePriority(new_priority);
   }
 }