Kernel: Surface errors when generating a process core dump :^)

Author: https://github.com/bgianfo
Commit: d7568b28b4
Pull-request: https://github.com/SerenityOS/serenity/pull/11126

Kernel/Process.h

@@ -527,7 +527,7 @@ private:
 
     void kill_threads_except_self();
     void kill_all_threads();
-    bool dump_core();
+    ErrorOr<void> dump_core();
     bool dump_perfcore();
     bool create_perf_events_buffer_if_needed();
     void delete_perf_events_buffer();