LibC: Make time_t signed integer

Some port like python3 assumes this is the case

kernel/kernel/FS/FAT/Inode.cpp

@@ -30,19 +30,19 @@ namespace Kernel
 
 	timespec FATInode::atime() const
 	{
-		uint64_t epoch = fat_date_to_epoch(m_entry.last_access_date, {});
+		const time_t epoch = fat_date_to_epoch(m_entry.last_access_date, {});
 		return timespec { .tv_sec = epoch, .tv_nsec = 0 };
 	}
 
 	timespec FATInode::mtime() const
 	{
-		uint64_t epoch = fat_date_to_epoch(m_entry.write_date, m_entry.write_time);
+		const time_t epoch = fat_date_to_epoch(m_entry.write_date, m_entry.write_time);
 		return timespec { .tv_sec = epoch, .tv_nsec = 0 };
 	}
 
 	timespec FATInode::ctime() const
 	{
-		uint64_t epoch = fat_date_to_epoch(m_entry.creation_date, m_entry.creation_time);
+		const time_t epoch = fat_date_to_epoch(m_entry.creation_date, m_entry.creation_time);
 		return timespec { .tv_sec = epoch, .tv_nsec = 0 };
 	}
 

kernel/kernel/Timer/HPET.cpp

@@ -299,7 +299,7 @@ namespace Kernel
 		long ns_this_second = ticks_this_second * regs.counter_clk_period / FS_PER_NS;
 
 		return timespec {
-			.tv_sec = seconds,
+			.tv_sec = static_cast<time_t>(seconds),
 			.tv_nsec = ns_this_second
 		};
 	}