Put missing check_state() in some places

Fixes a few verification failures while closing the emulator with HLE liblv2

rpcs3/Emu/Cell/Modules/cellSaveData.cpp

@@ -381,7 +381,10 @@ static NEVER_INLINE error_code savedata_op(ppu_thread& ppu, u32 operation, u32 v
 			selected = Emu.GetCallbacks().get_save_dialog()->ShowSaveDataList(save_entries, focused, operation, listSet);
 
 			// Reschedule
-			ppu.check_state();
+			if (ppu.check_state())
+			{
+				return 0;
+			}
 
 			// UI returns -1 for new save games
 			if (selected == -1)

rpcs3/Emu/Cell/Modules/sys_lwcond_.cpp

@@ -297,6 +297,11 @@ error_code sys_lwcond_wait(ppu_thread& ppu, vm::ptr<sys_lwcond_t> lwcond, u64 ti
 	// call the syscall
 	const error_code res = _sys_lwcond_queue_wait(ppu, lwcond->lwcond_queue, lwmutex->sleep_queue, timeout);
 
+	if (ppu.test_stopped())
+	{
+		return 0;
+	}
+
 	if (res == CELL_OK || res == CELL_ESRCH)
 	{
 		if (res == CELL_OK)

rpcs3/Emu/Cell/Modules/sys_lwmutex_.cpp

@@ -167,6 +167,11 @@ error_code sys_lwmutex_lock(ppu_thread& ppu, vm::ptr<sys_lwmutex_t> lwmutex, u64
 	// lock using the syscall
 	const error_code res = _sys_lwmutex_lock(ppu, lwmutex->sleep_queue, timeout);
 
+	if (ppu.test_stopped())
+	{
+		return 0;
+	}
+
 	lwmutex->all_info--;
 
 	if (res == CELL_OK)
@@ -211,6 +216,11 @@ error_code sys_lwmutex_lock(ppu_thread& ppu, vm::ptr<sys_lwmutex_t> lwmutex, u64
 
 			const error_code res_ = _sys_lwmutex_lock(ppu, lwmutex->sleep_queue, timeout);
 
+			if (ppu.test_stopped())
+			{
+				return 0;
+			}
+
 			if (res_ == CELL_OK)
 			{
 				lwmutex->vars.owner.release(tid);