Kernel: Make VirtIOConsole block when VirtIOQueue is full

Author: https://github.com/ccapitalK
Commit: 45f97c1096
Pull-request: https://github.com/SerenityOS/serenity/pull/6442
Reviewed-by: https://github.com/IdanHo ✅

Kernel/VirtIO/VirtIOConsole.cpp

@@ -110,7 +110,7 @@ KResultOr<size_t> VirtIOConsole::read(FileDescription&, u64, [[maybe_unused]] Us
 
 bool VirtIOConsole::can_write(const FileDescription&, size_t) const
 {
-    return true;
+    return get_queue(TRANSMITQ).can_write();
 }
 
 KResultOr<size_t> VirtIOConsole::write(FileDescription&, u64, const UserOrKernelBuffer& data, size_t size)