Make Errno public and use it in ReplyXxx::error

[stepancheg]

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[cberner]

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[Copilot]

Pull request overview

This PR refactors error handling by making Errno a public type and updating all ReplyXxx::error methods to accept Errno instead of c_int. This provides type safety and a clearer API for error handling across the codebase.

Changes:

• Made Errno type public through src/lib.rs
• Updated all ReplyXxx::error method signatures to accept Errno instead of c_int
• Migrated all error handling code to use Errno constants instead of raw libc error codes
• Added EFTYPE constant for FreeBSD/macOS platforms

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/reply.rs	Updated all Reply type error methods to accept Errno instead of c_int, removed assertion check
src/ll/mod.rs	Added EFTYPE errno constant and improved documentation for from_i32
src/lib.rs	Exported Errno as public type, updated default implementations to use Errno constants
src/experimental.rs	Updated Result type alias to use Errno instead of c_int
examples/simple.rs	Migrated all error handling to use Errno type throughout the filesystem implementation
examples/poll.rs	Replaced raw libc error constants with Errno type
examples/passthrough.rs	Updated error handling to use Errno::ENOENT
examples/notify_inval_inode.rs	Migrated error handling to Errno type
examples/notify_inval_entry.rs	Updated error responses to use Errno type
examples/ioctl.rs	Replaced libc error constants with Errno equivalents
examples/hello.rs	Updated error handling to use Errno::ENOENT
examples/async_hello.rs	Migrated async filesystem implementation to use Errno type

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