GS/HW: Clean up HandleTextureHazards.

Warnings, initializations, dereferencing null pointers.

pcsx2/GS/Renderers/HW/GSRendererHW.cpp

@@ -6333,7 +6333,7 @@ __ri void GSRendererHW::HandleTextureHazards(const GSTextureCache::Target* rt, c
 			src_target = rt;
 		}
 		// Be careful of single page channel shuffles where depth is the source but it's not going to the same place, we can't read this directly.
-		else if (ds && m_conf.tex == m_conf.ds && (!m_channel_shuffle || static_cast<int>(m_cached_ctx.FRAME.Block() - rt->m_TEX0.TBP0) == static_cast<int>(m_cached_ctx.ZBUF.Block() - ds->m_TEX0.TBP0)))
+		else if (ds && m_conf.tex == m_conf.ds && (!m_channel_shuffle || (rt && static_cast<int>(m_cached_ctx.FRAME.Block() - rt->m_TEX0.TBP0) == static_cast<int>(m_cached_ctx.ZBUF.Block() - ds->m_TEX0.TBP0))))
 		{
 			// GL, Vulkan (in General layout), not DirectX!
 			const bool can_read_current_depth_buffer = g_gs_device->Features().test_and_sample_depth;
@@ -6369,10 +6369,9 @@ __ri void GSRendererHW::HandleTextureHazards(const GSTextureCache::Target* rt, c
 	// We need to copy. Try to cut down the source range as much as possible so we don't copy texels we're not reading.
 	const GSVector2i& src_unscaled_size = src_target->GetUnscaledSize();
 	const GSVector4i src_bounds = src_target->GetUnscaledRect();
-	GSVector4i copy_range;
-	GSVector2i copy_size;
-	GSVector2i copy_dst_offset;
-	const bool copied_rt = src_target && !tex->m_shared_texture;
+	GSVector4i copy_range = GSVector4i::zero();
+	GSVector2i copy_size = GSVector2i(0);
+	GSVector2i copy_dst_offset = GSVector2i(0);
 	// Shuffles take the whole target. This should've already been halved.
 	// We can't partially copy depth targets in DirectX, and GL/Vulkan should use the direct read above.
 	// Restricting it also breaks Tom and Jerry...
@@ -6496,16 +6495,11 @@ __ri void GSRendererHW::HandleTextureHazards(const GSTextureCache::Target* rt, c
 
 	unscaled_size = copy_size;
 	scale = m_downscale_source ? 1.0f : src_target->GetScale();
-	const float src_scale = src_target->GetScale();
 	GL_CACHE("HW: Copy size: %dx%d, range: %d,%d -> %d,%d (%dx%d) @ %.1f", copy_size.x, copy_size.y, copy_range.x,
 		copy_range.y, copy_range.z, copy_range.w, copy_range.width(), copy_range.height(), scale);
 
 	const GSVector2i scaled_copy_size = GSVector2i(static_cast<int>(std::ceil(static_cast<float>(copy_size.x) * scale)),
 		static_cast<int>(std::ceil(static_cast<float>(copy_size.y) * scale)));
-	const GSVector4i scaled_copy_range = GSVector4i((GSVector4(copy_range) * GSVector4(src_scale)).ceil());
-	const GSVector2i scaled_copy_dst_offset =
-		GSVector2i(static_cast<int>(std::ceil(static_cast<float>(copy_dst_offset.x) * scale)),
-			static_cast<int>(std::ceil(static_cast<float>(copy_dst_offset.y) * scale)));
 
 	src_copy.reset(src_target->m_texture->IsDepthStencil() ?
 				   g_gs_device->CreateDepthStencil(scaled_copy_size.x, scaled_copy_size.y, src_target->m_texture->GetFormat(), false) :