[Bug runtime/28378] semantic error: process return probes not available [man error::inode-uprobes]

["nylon7717 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28378

--- Comment #5 from Nylon Chen <nylon7717 at gmail dot com> ---
Hi Mark Wielaard,

thanks for your help

When I use process.statement() or process.function replace 
process.function().return 

I can fix "error::inode-uprobes" issue

but my stap has other error
"semantic error: while processing probe tp_syscall.read.return from:
nd_syscall.read.return from: syscall.read.return from: syscall.read.return"

I try to reduce this stap script

```
...

probe syscall.write { write_fds[tid()] = fd }

probe syscall.write.return {
  p = pid()
  // Get fd even if non-dwarf syscall return probe.
  fd = write_fds[tid()]
  delete write_fds[tid()]
  bytes = retval
  time = gettimeofday_us() - @entry(gettimeofday_us())
  if (bytes > 0)
    filewrite[p, fd] <<< bytes
  time_io[p, fd] <<< time
}

...
```

the error message point out the problem is "syscall.xxx.return"

I try to comment (/**/) it, and the compiler's result is ok

I just curious about this result.

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