Even more crash fixes

Common/GPU/Vulkan/VulkanContext.cpp

@@ -1199,6 +1199,12 @@ static std::string surface_transforms_to_string(VkSurfaceTransformFlagsKHR trans
 }
 
 bool VulkanContext::InitSwapchain() {
+	_assert_(physical_device_ >= 0 && physical_device_ < physical_devices_.size());
+	if (!surface_) {
+		ERROR_LOG(G3D, "VK: No surface, can't create swapchain");
+		return false;
+	}
+
 	VkResult res = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physical_devices_[physical_device_], surface_, &surfCapabilities_);
 	if (res == VK_ERROR_SURFACE_LOST_KHR) {
 		// Not much to do.

Core/FileSystems/VirtualDiscFileSystem.cpp

@@ -645,7 +645,7 @@ PSPFileInfo VirtualDiscFileSystem::GetFileInfo(std::string filename) {
 			localtime_r((time_t*)&mtime, &x.mtime);
 		}
 
-		x.startSector = fileList[fileIndex].firstBlock;
+		// x.startSector was set above in "if (fileIndex != -1)".
 		x.numSectors = (x.size+2047)/2048;
 	}
 

Core/HW/AsyncIOManager.cpp

@@ -29,6 +29,7 @@
 #include "Core/FileSystems/MetaFileSystem.h"
 
 bool AsyncIOManager::HasOperation(u32 handle) {
+	std::lock_guard<std::mutex> guard(resultsLock_);
 	if (resultsPending_.find(handle) != resultsPending_.end()) {
 		return true;
 	}
@@ -60,6 +61,7 @@ bool AsyncIOManager::HasResult(u32 handle) {
 }
 
 bool AsyncIOManager::PopResult(u32 handle, AsyncIOResult &result) {
+	// This is called under lock from WaitResult, no need to lock again.
 	if (results_.find(handle) != results_.end()) {
 		result = results_[handle];
 		results_.erase(handle);
@@ -75,6 +77,7 @@ bool AsyncIOManager::PopResult(u32 handle, AsyncIOResult &result) {
 }
 
 bool AsyncIOManager::ReadResult(u32 handle, AsyncIOResult &result) {
+	// This is called under lock from WaitResult, no need to lock again.
 	if (results_.find(handle) != results_.end()) {
 		result = results_[handle];
 		return true;

UI/GameSettingsScreen.cpp

@@ -1420,7 +1420,7 @@ void GameSettingsScreen::dialogFinished(const Screen *dialog, DialogResult resul
 }
 
 void GameSettingsScreen::RecreateViews() {
-	oldSettingInfo_ = settingInfo_->GetText();
+	oldSettingInfo_ = settingInfo_ ? settingInfo_->GetText() : "N/A";
 	UIScreen::RecreateViews();
 }
 

UI/MiscScreens.cpp

@@ -1114,5 +1114,5 @@ void SettingInfoMessage::Draw(UIContext &dc) {
 }
 
 std::string SettingInfoMessage::GetText() const {
-	return showing_ && text_ ? text_->GetText() : "";
+	return (showing_ && text_) ? text_->GetText() : "";
 }