Kernel/FileSystem: Fix check of read offset for the RAMFSInode code

The check of ensuring we are not trying to read beyond the end of the
inode data buffer is already there, it's just that we need to disallow
further reading if the read offset equals to the inode data size.

Kernel/FileSystem/RAMFS/Inode.cpp

@@ -127,7 +127,7 @@ ErrorOr<size_t> RAMFSInode::read_bytes_from_content_space(size_t offset, size_t
 {
     VERIFY(m_inode_lock.is_locked());
     VERIFY(m_metadata.size >= 0);
-    if (static_cast<size_t>(m_metadata.size) < offset)
+    if (offset >= static_cast<size_t>(m_metadata.size))
         return 0;
     auto mapping_region = TRY(MM.allocate_kernel_region(DataBlock::block_size, "RAMFSInode Mapping Region"sv, Memory::Region::Access::Read, AllocationStrategy::Reserve));
     return const_cast<RAMFSInode&>(*this).do_io_on_content_space(*mapping_region, offset, io_size, buffer, false);