Kernel: Don't use the profile timer if we don't have a timer to assign

Author: https://github.com/supercomputer7
Commit: 8a4cc735b9
Pull-request: https://github.com/SerenityOS/serenity/pull/7140
Reviewed-by: https://github.com/IdanHo ✅

Kernel/Time/TimeManagement.h

@@ -56,8 +56,8 @@ public:
 
     static bool is_hpet_periodic_mode_allowed();
 
-    void enable_profile_timer();
-    void disable_profile_timer();
+    bool enable_profile_timer();
+    bool disable_profile_timer();
 
     u64 uptime_ms() const;
     static Time now();