Kernel: Don't allow opening file with path ""

kernel/kernel/Process.cpp

@@ -445,6 +445,9 @@ namespace Kernel
 	{
 		ASSERT(m_process_lock.is_locked());
 
+		if (path[0] == '\0')
+			return BAN::Error::from_errno(ENOENT);
+
 		auto relative_parent = TRY(find_relative_parent(fd, path));
 
 		VirtualFileSystem::File parent;