sys_spu: Don't reset snr config at group_start()

Also first check for EINVAL in sys_spu_thread_set_spu_cfg

rpcs3/Emu/Cell/SPUThread.cpp

@@ -1055,8 +1055,6 @@ void spu_thread::cpu_init()
 	ch_out_mbox.data.raw() = {};
 	ch_out_intr_mbox.data.raw() = {};
 
-	snr_config = 0;
-
 	ch_snr1.data.raw() = {};
 	ch_snr2.data.raw() = {};
 
@@ -1068,6 +1066,11 @@ void spu_thread::cpu_init()
 	ch_dec_start_timestamp = get_timebased_time(); // ???
 	ch_dec_value = 0;
 
+	if (offset >= RAW_SPU_BASE_ADDR)
+	{
+		snr_config = 0;
+	}
+
 	run_ctrl.raw() = 0;
 	status.raw() = 0;
 	npc.raw() = 0;

rpcs3/Emu/Cell/SPUThread.h

@@ -546,7 +546,7 @@ public:
 	spu_channel ch_out_mbox;
 	spu_channel ch_out_intr_mbox;
 
-	u64 snr_config; // SPU SNR Config Register
+	u64 snr_config = 0; // SPU SNR Config Register
 
 	spu_channel ch_snr1; // SPU Signal Notification Register 1
 	spu_channel ch_snr2; // SPU Signal Notification Register 2

rpcs3/Emu/Cell/lv2/sys_spu.cpp

@@ -963,6 +963,11 @@ error_code sys_spu_thread_set_spu_cfg(ppu_thread& ppu, u32 id, u64 value)
 
 	sys_spu.warning("sys_spu_thread_set_spu_cfg(id=0x%x, value=0x%x)", id, value);
 
+	if (value > 3)
+	{
+		return CELL_EINVAL;
+	}
+
 	const auto thread = idm::get<named_thread<spu_thread>>(id);
 
 	if (UNLIKELY(!thread || !thread->group))
@@ -970,11 +975,6 @@ error_code sys_spu_thread_set_spu_cfg(ppu_thread& ppu, u32 id, u64 value)
 		return CELL_ESRCH;
 	}
 
-	if (value > 3)
-	{
-		return CELL_EINVAL;
-	}
-
 	thread->snr_config = value;
 
 	return CELL_OK;