Fix leak in mesh upload floater

indra/newview/llfloatermodelpreview.cpp

@@ -133,7 +133,7 @@ mAvatarTabIndex(0)
 	sInstance = this;
 	mLastMouseX = 0;
 	mLastMouseY = 0;
-	mStatusLock = new LLMutex();
+	mStatusLock = std::make_unique<LLMutex>();
 	mModelPreview = NULL;
 
 	mLODMode[LLModel::LOD_HIGH] = 0;
@@ -314,8 +314,7 @@ LLFloaterModelPreview::~LLFloaterModelPreview()
 		delete mModelPreview;
 	}
 
-	delete mStatusLock;
-	mStatusLock = NULL;
+    mStatusLock.reset();
 }
 
 void LLFloaterModelPreview::initModelPreview()
@@ -1659,7 +1658,7 @@ void LLFloaterModelPreview::setCtrlLoadFromFile(S32 lod)
 
 void LLFloaterModelPreview::setStatusMessage(const std::string& msg)
 {
-	LLMutexLock lock(mStatusLock);
+	LLMutexLock lock(mStatusLock.get());
 	mStatusMessage = msg;
 }
 

indra/newview/llfloatermodelpreview.h

@@ -201,7 +201,7 @@ class LLFloaterModelPreview final : public LLFloaterModelUploadBase
 	// 2 - use LoD above
 	S32 mLODMode[4];
 
-	LLMutex* mStatusLock;
+	std::unique_ptr<LLMutex> mStatusLock;
 
 	LLSD mModelPhysicsFee;